O'Sullivan, M., Davies, M. L., & Thomson, G. D. (1938). Twenty years a-growing. Penguin.
Chicago Style (17th ed.) CitationO'Sullivan, Maurice, Moya Llewelyn Davies, and George Derwent Thomson. Twenty Years A-growing. Harmondsworth [etc.]: Penguin, 1938.
MLA (9th ed.) CitationO'Sullivan, Maurice, et al. Twenty Years A-growing. Penguin, 1938.
Warning: These citations may not always be 100% accurate.