Style de citation APA (7e éd.)

Ullrich, R. A. (1981). Motivation methods that work. Prentice-Hall.

Style de citation Chicago (17e éd.)

Ullrich, Robert A. Motivation Methods That Work. Englewood Cliffs, N.J.: Prentice-Hall, 1981.

Style de citation MLA (9e éd.)

Ullrich, Robert A. Motivation Methods That Work. Prentice-Hall, 1981.