Cita APA (7th ed.)
Gatenby, E. V. (1960). A direct Method English Course (1a. ed.). Longman.
Cita Chicago (17th ed.)
Gatenby, E. V. A Direct Method English Course. 1a. ed. Hong Kong: Longman, 1960.
Cita MLA (9th ed.)
Gatenby, E. V. A Direct Method English Course. 1a. ed. Longman, 1960.
Atenció: Aquestes cites poden no estar 100% correctes.