Cita APA (7a ed.)

O'Sullivan, M., Davies, M. L., & Thomson, G. D. (1938). Twenty years a-growing. Penguin.

Cita Chicago Style (17a ed.)

O'Sullivan, Maurice, Moya Llewelyn Davies, y George Derwent Thomson. Twenty Years A-growing. Harmondsworth [etc.]: Penguin, 1938.

Cita MLA (9a ed.)

O'Sullivan, Maurice, et al. Twenty Years A-growing. Penguin, 1938.