Παραπομπή APA

Levine, M. (1994). Effective problem solving (2nd edition.). Prentice-Hall of India.

Παραπομπή Chicago Style

Levine, Marvin. Effective Problem Solving. 2nd edition. Englewood Cliffs: Prentice-Hall of India, 1994.

Παραπομπή MLA

Levine, Marvin. Effective Problem Solving. 2nd edition. Prentice-Hall of India, 1994.