APA (7th ed.) Citation

Bill Douglas Centre & Hamilton, C. (1915). The gem library. Amalgamated Press.

Chicago Style (17th ed.) Citation

Bill Douglas Centre and Charles Hamilton. The Gem Library. London: Amalgamated Press, 1915.

MLA (9th ed.) Citation

Bill Douglas Centre and Charles Hamilton. The Gem Library. Amalgamated Press, 1915.

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