Johnson, Laura, T. Tank, Jennifer L Hall, Robert O Jr., Patrick J Mulholland, Stephen K Hamilton, Maurice H. Valett, Jackson R Webster, M. J Bernot, W. H McDowell, Bruce J Peterson, and Suzanne M Thomas. 2013. “Quantifying The Production Of Dissolved Organic Nitrogen In Headwater Streams Using 15N Tracer Additions”. Limnology and Oceanography 58(4): 1271-1285. http://www.treesearch.fs.fed.us/pubs/44613.

González, G., E. Cuevas, K. Nakamura, K. Ara, and M.F. Barberena-Arias. 2012. “Quantifying Variation Of Soil Arthropods Using Different Sampling Protocols: Is Diversity Affected?”. In , 51-70. http://www.intechopen.com/books/tropical-forests/quantifying-variation-of-soil-arthropods-using-different-sampling-protocols-is-diversity-affected-.

Yang, W. H. 2010. PhD “Quantification Of And Controls On Dinitrogen And Nitrous Oxide Fluxes From Terrestrial Ecosystems”. University of California.

Beard, K.H., S. McCullough, and A. Eschtruth. 2003. “Quantitative Assessment Of Habitat Preferences For The Puerto Rican Terrestrial Frog, Eleutherodactylus Coqui”. Journal of Herpetology 37(1): 10-17. http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1798&context=wild_facpub.

Hall, C.A.S. 2000. Quantifying Sustainable Development: The Future Of Tropical Economies. Academic Press.

Sanchez-de_Leon, Y. 1996. Master “Quantification, Isolation And Identification Of Ecologically Important Bioactive Compounds And Their Potential Effects On Humans”. University of Puerto Rico, Medical Science Campus.

Pringle, C.M., and G.A. Blake. 1994. “Quantitative Effects Of Atyid Shrimp(Decapoda: Atyidae) On The Depositional Environment In A Tropical Stream: Use Of Electricity For Experimental Exclusion. Canadian Journal Of Fisheries And Aquatic”. Science 51: 1443-1450. http://www.nrcresearchpress.com/doi/abs/10.1139/f94-144#.URwigX0VmY4.