Despite the blatant problems in the following (it was a paper I wrote for a class that I was asked to publish, only their were some problems with the formatting), the following has a fairly comprehensive account of my view of the community and (more importantly) an fairly extensive and diverse bibliography.

Article Panxenos: An Outsider's Sociology of Self

Maybe you're putting your question too simply, since this is (also) a proverbial semantic question i.e. concerning the relation between a signifier ('community', in this case) and what it stands for, its denotation. Because, of course, apart from different authors and viewpoints (countries and background seem redundant in this context) ) one also has to deal with a difference in subject matter to which the word 'community' is meant to refer.

A notorious case is one of the many definitions Kuhn uses for 'paradigm', namely a core assumption which is shared by all members of a specific scientific community. Here community and paradigm mutually define one another. 

Wikipedia kind of sums it all up when discussing Sarazons' 'sense of community':

"Sociologists, social psychologists, anthropologists, and others have theorized about and carried out empirical research on community, but the psychological approach asks questions about the individual's perception, understanding, attitudes, feelings, etc. about community and his or her relationship to it and to others' participation—indeed to the complete, multifaceted community experience."

As happens a lot, unfortunately, here too the experience of a social phenomenon (here community) is being separated from some sort of objective counterpart while this concept is meaningless unless all it's aspects are included in the definition.

I don't know the aim of this endeavor but it seems pretty clear that looking at definitions by different authors, with different (disciplinary) viewpoints will only add to the confusion unless

1 there is clarity about the basic properties of 'community' (such as do they comprise of humans who can know each other) 

2 a thoroughly interdisciplinary approach is applied.   

Dear @Andrew, thank you very much. Your document is very interesting.

Dear @Flip, Thank you very much. Your feedback is very suitable. I think the key is in what you say: "this concept is meaningless UNLESS it's all Aspects are included in the definition". For example, I have reference to Amitai Etzioni, which states that the community is defined by two characteristics: relationships among a group of individuals and commitment to a set of shared values, norms and meanings as well as a shared history and identity, that is, in a word, with a culture. However, I think It´s possible to be more ambitious and have a new and more comprehensive definition.

There have been many definitions of community over the years, moving from concepts of community as a location to relational to symbolism... to the collapse of community and then postmodern understandings and the influence of the internet.

Some suggested reading - I've highlighted the ones which might be good to start with as a general overview.

Anderson, B. (1983) Imagined Communities: Refections on the Origins and Spread of Nationalism, London & New York: Verso.

Bauman, Z. (2001) Community: Seeking safety in an insecure world, Cambridge: Polity Press.

Bell, C. & Newby, H. (1974) The Sociology of Community, London: Frank Cass and Company Limited.

Cohen, A. P. (1985) The Symbolic Construction of Community, London: Tavistock.

Crow, G. & Maclean, C. (2006) 'Community', in G. Payne (ed.) Social Divisions. (Second edition). Basingstoke, Hampshire: Palgrave Macmillan.

Day, G. (2006) Community and Everyday Life, Abingdon: Routledge.

Delanty, G. (2003) Community, London: Routledge.

Elias, N. (1974) 'Towards a theory of communities.', in C. Bell & H. Newby (eds.) The Sociology of Community. London: Frank Cass and Company Limited.

Hillery, G. A. (1955) 'Definitions of Community, Areas of Agreement', Rural Sociology, 20(2), 111-23.

McMillan, D. W. & Chavis, D. M. (1986) 'Sense of community: A definition and theory', Journal of community psychology, 14(1), 6-23.

Pahl, R. & Spencer, L. (2004) 'Capturing personal communities', Social networks and social exclusion: Sociological and policy perspectives, 72-96.

Sarason, S. B. (1974) The psychological sense of community: Prospects for a community psychology: Jossey-Bass.

Somerville, P. (2011) Understanding Community: Politics, Policy and Practice, Bristol: The Policy Press.

Blackshaw, T. (2010) Key Concepts in Community Studies, London: Sage Publications Ltd.

Chayko, M. (2002) Connecting: How We Form Social Bonds and Communities in the Internet Age, Albany, NY: State University of New York.