Style de citation APA

Easa, P. S. A., & Jayson, E. A. A. (2004). A field guide to animal signs.

Style de citation Chicago

Easa, P S; Author, et E A; Author Jayson. A Field Guide to Animal Signs. Thrissur, Kerala Forest Research Institute, 2004.

Style de citation MLA

Easa, P S; Author, et E A; Author Jayson. A Field Guide to Animal Signs. 2004.