Cita APA

Engel, A., & Engel, A. (1998). Problem-solving strategies. New York, New York: Springer.

Citación estilo Chicago

Engel, Arthur, y Arthur Engel. Problem-solving Strategies. New York, New York: Springer, 1998.

Cita MLA

Engel, Arthur, y Arthur Engel. Problem-solving Strategies. New York, New York: Springer, 1998.