Παραπομπή APA

Bonewitz, R. L. (2012). Rocks and minerals. Dorling kindersley.

Παραπομπή Chicago Style

Bonewitz, Ronald Louis. Rocks and Minerals. London: Dorling kindersley, 2012.

Παραπομπή MLA

Bonewitz, Ronald Louis. Rocks and Minerals. Dorling kindersley, 2012.