Citazione Stile APA (7a Edizione)

Levine, M. (1994). Effective problem solving (2nd ed.). Prentice Hall.

Citazione stile Chigago Style (17a edizione)

Levine, Marvin. Effective Problem Solving. 2nd ed. Englewood Cliffs, N.J: Prentice Hall, 1994.

Citatione MLA (9a ed.)

Levine, Marvin. Effective Problem Solving. 2nd ed. Prentice Hall, 1994.