O'Brien, T.G. 2010. Abundance, density and relative abundance: A conceptual framework. in O’Connell, A.F.; Nichols, J.D.; Karanth, K.U. . Camera Traps in Animal Ecology: Methods and Analyses. Springer Verlag, Tokyo. 
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O'Brien, T.G. 2008. On the use of automated cameras to estimate species richness for large and medium sized rainforest mammals. Animal Conservation. 11:179-181. 
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O'Brien, T.G., and M.F. Kinnaird. 2008. A picture is worth a thousand words: The application of camera trapping to the study of birds. Bird Conservation International. 18:S144-S162. 
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O'Brien, T. 2010. Wildlife Picture Index: Implementation Manual Version 1.0. WCS Working Papers. 39: Wildlife Conservation Society, Bronx, New York. 
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Andelman, S.J., J.A. Ahumada, T. O'Brien, and F. Rovero. 2010. A global system for monitoring tropical mammal communities. 24th International Congress for Conservation Biology. Jul 3, 2010. Edmonton, Canada. 
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