APA

Shumaker R. W., Walkup K. R. & Beck B. B. (2011). Animal tool behavior. Baltimore, Md: Johns Hopkins University Press.

Chicago

Shumaker Robert W, Walkup Kristina R and Beck Benjamin B. 2011. Animal tool behavior. Baltimore, Md: Johns Hopkins University Press.

Harvard

Shumaker R. W., Walkup K. R. and Beck B. B. (2011). Animal tool behavior. Baltimore, Md: Johns Hopkins University Press.

MLA

Shumaker Robert W, Walkup Kristina R and Beck Benjamin B. Animal tool behavior. Baltimore, Md: Johns Hopkins University Press. 2011.