MLA

Groenewegen, Alida J. M. What Happened ? : Diagnosing Unfamiliar Real-life Situations. Leiden, 1990.

APA

Groenewegen, A. J. M. (1990). What happened ? : diagnosing unfamiliar real-life situations. Leiden.

Chicago

Groenewegen, Alida J. M. What Happened ? : Diagnosing Unfamiliar Real-Life Situations. Leiden, 1990.