APA (7th ed.) Citation

Marcuse, H. (1969). An essay on liberation. Penguin Books.

Chicago Style (17th ed.) Citation

Marcuse, Herbert. An Essay on Liberation. Harmondsworth, Moddlesex: Penguin Books, 1969.

MLA (9th ed.) Citation

Marcuse, Herbert. An Essay on Liberation. Penguin Books, 1969.

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