MLA

Robbins, Judd, and H. E Leydens-Bartray. De Essenties Van Os/2. Düsseldorf: Sybex, 1988.

APA

Robbins, J., & Leydens-Bartray, H. E. (1988). De essenties van OS/2. Düsseldorf: Sybex.

Chicago

Robbins, Judd, and H. E Leydens-Bartray. De Essenties Van OS/2. Düsseldorf: Sybex, 1988.