Cita APA (7a ed.)

Allen, F. L. (1938). Only yesterday: An informal history of the nineteen-twenties in America. In two volumes. Penguin Books.

Cita Chicago Style (17a ed.)

Allen, Frederick Lewis. Only Yesterday: An Informal History of the Nineteen-twenties in America. In Two Volumes. Harmondsworth: Penguin Books, 1938.

Cita MLA (8a ed.)

Allen, Frederick Lewis. Only Yesterday: An Informal History of the Nineteen-twenties in America. In Two Volumes. Penguin Books, 1938.