APA (7th ed.) Citation

Webster, R. (1978). Practical gemmology : a study of the identification of gemstones, pearls and ornamental minerals: A study of the identification of gemstones, pearls and ornamental minerals (Sixth edition.). NAG Press.

Chicago Style (17th ed.) Citation

Webster, Robert. Practical Gemmology : A Study of the Identification of Gemstones, Pearls and Ornamental Minerals: A Study of the Identification of Gemstones, Pearls and Ornamental Minerals. Sixth edition. London: NAG Press, 1978.

MLA (9th ed.) Citation

Webster, Robert. Practical Gemmology : A Study of the Identification of Gemstones, Pearls and Ornamental Minerals: A Study of the Identification of Gemstones, Pearls and Ornamental Minerals. Sixth edition. NAG Press, 1978.

Warning: These citations may not always be 100% accurate.