Coulter, S. (1980). Threshold. Panther.
Cita Chicago (17th ed.)Coulter, Sephen. Threshold. London: Panther, 1980.
Cita MLA (9th ed.)Coulter, Sephen. Threshold. Panther, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)