APA (7th ed.) Citation

Thomas, A. (1987). Goodbye Harold, good luck. Penguin Books.

Chicago Style (17th ed.) Citation

Thomas, Audrey. Goodbye Harold, Good Luck. Markham, Ontario [u.a.]: Penguin Books, 1987.

MLA (9th ed.) Citation

Thomas, Audrey. Goodbye Harold, Good Luck. Penguin Books, 1987.

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