Cita APA (7a ed.)

Cole, G. D. H. (1937). Persons and periods. Penguisn Books.

Cita Chicago Style (17a ed.)

Cole, George D. H. Persons and Periods. USA: Penguisn Books, 1937.

Cita MLA (8a ed.)

Cole, George D. H. Persons and Periods. Penguisn Books, 1937.