Carr, H (1927). "The interpretation of the animal mind". Psychological Review. 34 (2): 87–106 [94]. doi:10.1037/h0072244.
merriam-webster.com
"consciousness". Merriam-Webster. Diakses tanggal 22 April 2014.
stanford.edu
plato.stanford.edu
Robert van Gulick (2004). "Consciousness". Stanford Encyclopedia of Philosophy.
Colin Allen. Edward N. Zalta, ed. "Animal consciousness". Stanford Encyclopedia of Philosophy (Summer 2011 Edition).
web.archive.org
The Cambridge Declaration on Consciousness (Archive) 7 July 2012. Written by Philip Low and edited by Jaak Panksepp, Diana Reiss, David Edelman, Bruno Van Swinderen, Philip Low and Christof Koch. University of Cambridge.