Παραπομπή APA

Heyns, R. W. (1958). The psychology of personal adjustment. Rinehart and winston.

Παραπομπή Chicago Style

Heyns, Roger W. The Psychology of Personal Adjustment. United state: Rinehart and winston, 1958.

Παραπομπή MLA

Heyns, Roger W. The Psychology of Personal Adjustment. Rinehart and winston, 1958.