Cita APA (7a ed.)

Hull, C. L. (1932). The goal gradient hypothesis and maze learning. [s.n.].

Cita Chicago Style (17a ed.)

Hull, Clark Leonard. The Goal Gradient Hypothesis and Maze Learning. [S.l.]: [s.n.], 1932.

Cita MLA (9a ed.)

Hull, Clark Leonard. The Goal Gradient Hypothesis and Maze Learning. [s.n.], 1932.