Παραπομπή APA

Evans, I. (1972). Rocks, minerals and gemstones. Hamlyn.

Παραπομπή Chicago Style

Evans, I.O. Rocks, Minerals and Gemstones. London: Hamlyn, 1972.

Παραπομπή MLA

Evans, I.O. Rocks, Minerals and Gemstones. Hamlyn, 1972.