Cita APA

Robert Ludlum & Gayle Lynds. (2000). The heads factor. Harper Collins.

Chicago Edition Citation

Robert Ludlum i Gayle Lynds. The Heads Factor. London: Harper Collins, 2000.

Cita MLA

Robert Ludlum i Gayle Lynds. The Heads Factor. Harper Collins, 2000.

Atenció: Aquestes cites poden no estar 100% correctes.