Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.