APA (7th ed.) Citation

Webster, R. (1970). Gems : their sources, descriptions and: Identification. Butterworths.

Chicago Style (17th ed.) Citation

Webster, Robert. Gems : Their Sources, Descriptions and: Identification. London: Butterworths, 1970.

MLA (9th ed.) Citation

Webster, Robert. Gems : Their Sources, Descriptions and: Identification. Butterworths, 1970.

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