Cita APA (7th ed.)
Graham, B. (1983). Approaching hoofbeats: The four horsemen of the apocalypse. Word.
Cita Chicago (17th ed.)
Graham, Billy. Approaching Hoofbeats: The Four Horsemen of the Apocalypse. Waco: Word, 1983.
Cita MLA (9th ed.)
Graham, Billy. Approaching Hoofbeats: The Four Horsemen of the Apocalypse. Word, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.