Παραπομπή APA

Ludlum, R. (1989). gemini contenders. Bantam Books.

Παραπομπή Chicago Style

Ludlum, Robert. Gemini Contenders. New York: Bantam Books, 1989.

Παραπομπή MLA

Ludlum, Robert. Gemini Contenders. Bantam Books, 1989.