APA (7th ed.) Citation

Horne, A. (1988). Harold Macmillan. Viking [u.a..

Chicago Style (17th ed.) Citation

Horne, Alistair. Harold Macmillan. New York [u.a.]: Viking [u.a., 1988.

MLA (8th ed.) Citation

Horne, Alistair. Harold Macmillan. Viking [u.a., 1988.