Παραπομπή APA

Duvall, S. M. (1961). The art and skill of getting along with people. Prentice Hall Inc.

Παραπομπή Chicago Style

Duvall, Sylvanus M. The Art and Skill of Getting Along with People. United States: Prentice Hall Inc, 1961.

Παραπομπή MLA

Duvall, Sylvanus M. The Art and Skill of Getting Along with People. Prentice Hall Inc, 1961.