Παραπομπή APA

Lauwerys, J. (1971). sciences: Understanding. Grolier.

Παραπομπή Chicago Style

Lauwerys, J.A. Sciences: Understanding. London: Grolier, 1971.

Παραπομπή MLA

Lauwerys, J.A. Sciences: Understanding. Grolier, 1971.