APA Citation

 Walker, C. H. (2012).  Principles of ecotoxicology.  CRC Press.

Chicago Style Citation

 Walker, C. H.  Principles of Ecotoxicology.  CRC Press, 2012.

MLA Citation

 Walker, C. H.  Principles of Ecotoxicology.  CRC Press, 2012.

Warning: These citations may not always be 100% accurate.