APA (7th ed.) Citation

Horne, A. (1991). Harold Macmillan (1. print.). Penguin Books.

Chicago Style (17th ed.) Citation

Horne, Alistair. Harold Macmillan. 1. print. New York, NY [u.a.]: Penguin Books, 1991.

MLA (9th ed.) Citation

Horne, Alistair. Harold Macmillan. 1. print. Penguin Books, 1991.