You can start by reading The handbook of innovation and services : a multi-disciplinary perspective / edited by Faiz Gallouj, Faridah Djellal in 2010 (Cheltenham [etc.] : Edward Elgar)

Bayesian Belief Networks are a very interesting way of exploring service innovation

Thank you so much for suggestions.

Service dominant logic. See Vargo & Lusch, 2008 ( and earlier) - this would work if you are looking at service innovation at a generic level.

but it depends what your focus is. Are you looking at the process, the organisation, the development, the adoption 

The intellectual territory that revolves around service innovation can be mapped through three well-established school of thoughts which are predominant in influencing academic debate in the field. The three literature streams include service-dominant logic (Vargo and Lusch, 2004), service logic (e.g. Grönroos, 2008) and service science (e.g. Chesbrough and Spohrer, 2006; Maglio and Spohrer, 2008).

Lusch and Nambisan (2015)

(Zhao et al., 2007)

(Lyytinen and Rose, 2003)

(Dermikan and Goul, 2006)

Brown et al. (2006)

(Clark, 1985)

(Barras, 1986/1990)

(Dermikan, 2008).

Sambamurthy et al. (2003)

(Feeny and Wilcocks, 1998; Henderson, 1990; Ross et al., 1996; Weill and Broadbent, 1998).

Den Hertog (2000)

(Miles, 2008)

(Neely, 2008; Vandermerwe and Rada, 1988).

(Kallinikos et al., 2013)

(Garud and Türtscher, 2008; Zittrain, 2008)

(Faulkner and Runde, 2009; Kallinikos et al., 2013; Yoo et al., 2010)

Thank you so much

If you're going to study in more service-dominant logic approach, Lusch and Nambisan (2015) has a good framework to explain recently

I suggest you review the book "service innovation": Organizational Responses to Technological Opportunities & market imperatives. (Tidd and Hull, 2003), It has theoretical aspects and case studies

Thanks a lot

Dear Yupal,

Please have a look at these papers: the first is about bank innovations, the second and the third trait the measurement of Company Innovative Leadership, including in the service sector.

Article Innovative Business Bank products

Article Measuring the Bulgarian IT Sector Innovations Capabilities T...

Article Company Innovative Leadership Model

Dear Yordanova,

Thank you so much for sending your feedback! All the papers are really useful to me.

Thanks for being so much kind to me.

Warm regards,

Yupal