Gaya APA

Robertson, J, M. (1915). A Short History of Freethought Ancient and Modern . London: Watts & Co, Johnson’s Court, Fleet Street E.C.

Gaya MLA

Robertson, John, M.. "A Short History of Freethought Ancient and Modern". London: Watts & Co, Johnson’s Court, Fleet Street E.C, 1915. Koleksi Elektronik.