1. Cavalieri, P., & Singer, P. (Eds.). (1993). The great ape project: Equality beyond humanity (p. 152). New York: St. Martins Griffin.
2. Griffin, M. H. (2013). Impact investing a guide for philanthropist and social investors. Northern Trust.
3. Koutstaal, P. R. (1996). Tradeable CO2 emission permits in Europe: a study on the design and consequences of a system of tradeable permits for reducing CO2 emissions in the European Union (p. 17). (PhD Diss., University of Groningen).
http://www.unicreditanduniversities.eu/uploads/assets/CEE_BTA/Dora_Fazekas.pdf
.
4. Ramanan, R., & Ashton, W. (September, 2012a) Green MBA and Integrating Sustainability in Business Education. Air and Waste Management Association’s Environmental Manager (pp. 13–15); also accessed Dec 2012 available at
http://stuart.iit.edu/about/faculty/pdf/green_mba.pdf
.
5. Ramanan, R., & Ashton, W. (September, 2012b) Green MBA and Integrating Sustainability in Business Education. Air and Waste Management Association’s Environmental Manager (pp. 13–15).