Cita APA (7a ed.)

Gatenby, E. V. (1962). A Direct Method English Course. Longmans.

Cita Chicago Style (17a ed.)

Gatenby, E. V. A Direct Method English Course. Londres: Longmans, 1962.

Cita MLA (9a ed.)

Gatenby, E. V. A Direct Method English Course. Longmans, 1962.