Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.

APA Citation Edition Citation

Webster, R. (1975). Gems: Their sources, descriptions and identification (3rd ed.). Butterworths.

Chicago Citation Edition Citation

Webster, Robert. Gems: Their Sources, Descriptions and Identification. 3rd ed. London/Boston: Butterworths, 1975.

MLA Citation Edition Citation

Webster, Robert. Gems: Their Sources, Descriptions and Identification. 3rd ed. Butterworths, 1975.