Cita APA (7a ed.)

Wasserman, E. A., Franklin, S. R., & Hearst, E. (1974). Pavlovian appetitive contingencies and approach versus withdrawal to conditioned stimuli in pigeons. [s.n.].

Cita Chicago Style (17a ed.)

Wasserman, Edward A., Stanley R. Franklin, y Eliot Hearst. Pavlovian Appetitive Contingencies and Approach Versus Withdrawal to Conditioned Stimuli in Pigeons. [S.l.]: [s.n.], 1974.

Cita MLA (9a ed.)

Wasserman, Edward A., et al. Pavlovian Appetitive Contingencies and Approach Versus Withdrawal to Conditioned Stimuli in Pigeons. [s.n.], 1974.