APA (7th ed.) Citation

Webster, R. (1976). Practical gemmology: A study of the identification of gem-stones, pearls, and ornamental minerals (5. ed.). NAG Pr.

Chicago Style (17th ed.) Citation

Webster, Robert. Practical Gemmology: A Study of the Identification of Gem-stones, Pearls, and Ornamental Minerals. 5. ed. London: NAG Pr, 1976.

MLA (9th ed.) Citation

Webster, Robert. Practical Gemmology: A Study of the Identification of Gem-stones, Pearls, and Ornamental Minerals. 5. ed. NAG Pr, 1976.