Changing the past

MLA

Berger, Thomas and Gotham Book Mart Collection (University of Pennsylvania). Changing the past. New York, N.Y., U.S.A. : Penguin Books, 1991.

APA

Berger, T. & Gotham Book Mart Collection (University of Pennsylvania). (1991). Changing the past. New York, N.Y., U.S.A. : Penguin Books.

Chicago

Berger, Thomas and Gotham Book Mart Collection (University of Pennsylvania). Changing the past. New York, N.Y., U.S.A. : Penguin Books, 1991.