APA (7th ed.) Citation

Robyns, G. (1978). The mystery of Agatha Christie. Penguin.

Chicago Style (17th ed.) Citation

Robyns, Gwen. The Mystery of Agatha Christie. New York: Penguin, 1978.

MLA (9th ed.) Citation

Robyns, Gwen. The Mystery of Agatha Christie. Penguin, 1978.

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