Cita APA (7th ed.)

ALEXANDER, L. (1980). Mainline: Beginers B (student' book). Longman.

Cita Chicago (17th ed.)

ALEXANDER, L.G. Mainline: Beginers B (student' Book). London: Longman, 1980.

Cita MLA (9th ed.)

ALEXANDER, L.G. Mainline: Beginers B (student' Book). Longman, 1980.