APA ציטוט

Woerkom, A. J. J. v. (1948). On the origin of comets.

Chicago Style (17th ed.) Citation

Woerkom, Adrianus Jan Jasper van. On the Origin of Comets. 1948.

ציטוט MLA

Woerkom, Adrianus Jan Jasper van. On the Origin of Comets. 1948.