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the following paper gives a nice review of ISA with plenty of references :

http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2664.2008.01571.x/full

the following is a review of the recent litterature in the field :

http://harvardforest.fas.harvard.edu/sites/harvardforest.fas.harvard.edu/files/publications/pdfs/Siddig_EcoIndic_2016.pdf

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for a wider perspective (and more technicalities), you can also check out those excellent slides

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If you use R, have a look at the function 'indval' in the labdsv package. It conducts Dufrene-Legendre indicator species analysis. 

I found it to do what I wanted and is relatively easy to use.

https://artax.karlin.mff.cuni.cz/r-help/library/labdsv/html/indval.html