Woerkom, A. J. J. v. (1948). On the origin of comets.
Chicago Style (17th ed.) CitationWoerkom, Adrianus Jan Jasper van. On the Origin of Comets. 1948.
MLA (8th ed.) CitationWoerkom, Adrianus Jan Jasper van. On the Origin of Comets. 1948.
Warning: These citations may not always be 100% accurate.