Cita APA

Schwartz, B., & Williams, D. R. (1972). Two different kinds of key peck in the pigeon: Some properties of responses maintained by negative and positive response-reinforcer contingencies.

Chicago Style Citation

Schwartz, Barry, i David R. Williams. Two Different Kinds of Key Peck in the Pigeon: Some Properties of Responses Maintained By Negative and Positive Response-reinforcer Contingencies. 1972.

Cita MLA

Schwartz, Barry, i David R. Williams. Two Different Kinds of Key Peck in the Pigeon: Some Properties of Responses Maintained By Negative and Positive Response-reinforcer Contingencies. 1972.