Cita APA (7a ed.)

Wells, H., Postgate, R., & Horrabin, J. (1956). The outline of history: Being a plain history of life and mankind. Garden City Books.

Cita Chicago Style (17a ed.)

Wells, H.G, Raymond Postgate, y J.F Horrabin. The Outline of History: Being a Plain History of Life and Mankind. New York: Garden City Books, 1956.

Cita MLA (9a ed.)

Wells, H.G, et al. The Outline of History: Being a Plain History of Life and Mankind. Garden City Books, 1956.