Cita APA (7th ed.)
Gill, G. (1990). Agatha Christie. Free Press.
Cita Chicago (17th ed.)
Gill, Gillian. Agatha Christie. New York: Free Press, 1990.
Cita MLA (9th ed.)
Gill, Gillian. Agatha Christie. Free Press, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.