APA-referens (7:e uppl.)

Willis, K., Gillson, L., & Virah-Sawmy, M. (2008). Nature or nuture: The ambiguity of C4 grasslands in Madagascar. Blackwell Publishing.

Chicago-referens (17:e uppl.)

Willis, K., L. Gillson, och M. Virah-Sawmy. Nature or Nuture: The Ambiguity of C4 Grasslands in Madagascar. Blackwell Publishing, 2008.

MLA-referens (9:e uppl.)

Willis, K., et al. Nature or Nuture: The Ambiguity of C4 Grasslands in Madagascar. Blackwell Publishing, 2008.