APA-Zitierstil (7. Ausg.)

Greene, B. (1990). Too late to turn back: Barbara and Graham Greene in Liberia. Penguin Books.

Chicago-Zitierstil (17. Ausg.)

Greene, Barbara. Too Late to Turn Back: Barbara and Graham Greene in Liberia. London u.a: Penguin Books, 1990.

MLA-Zitierstil (9. Ausg.)

Greene, Barbara. Too Late to Turn Back: Barbara and Graham Greene in Liberia. Penguin Books, 1990.