MLA

Nhibs, M Appel, and J. vanden Bogaerde. Zachte Energie; 1 En 2; Studierapport 5ar/1977-78. [S.l.]: [s.n.], .

APA

Nhibs, N., Appel, M., & Bogaerde, J. vanden. (.). Zachte energie; 1 en 2; studierapport 5AR/1977-78. [S.l.]: [s.n.].

Chicago

Nhibs, M Appel, and J. vanden Bogaerde. Zachte Energie; 1 En 2; Studierapport 5AR/1977-78. [S.l.]: [s.n.], ..