Gaya APA

Leggett, R., Kirchoff, B, K. (2011). Image use in field guides and identification keys: review and recommendations (2011 plr004). Oxford: Oxford University Press.

Gaya MLA

Leggett, Roxanne., Kirchoff, Bruce, K.. "Image use in field guides and identification keys: review and recommendations". 2011 plr004 Oxford: Oxford University Press, 2011. e-journal.