APA aipamena

Webster, R. (1983). Gems: Their sourse, descriptions and identification (4.).

Chicago Style aipamena

Webster, Robert. Gems: Their Sourse, Descriptions and Identification. 4. Methuen & Company, London, 1983.

MLA aipamena

Webster, Robert. Gems: Their Sourse, Descriptions and Identification. 4. 1983.