APA (7th ed.) Citation

Mayer, G. (1969). Friedrich Engels: A biography. H. Fertig.

Chicago Style (17th ed.) Citation

Mayer, Gustav. Friedrich Engels: A Biography. New York: H. Fertig, 1969.

MLA (9th ed.) Citation

Mayer, Gustav. Friedrich Engels: A Biography. H. Fertig, 1969.

Warning: These citations may not always be 100% accurate.