Cita APA (7th ed.)

Alexander, L. G. (1979). Mainline beginners B: Teacher's book. Longman.

Cita Chicago (17th ed.)

Alexander, Louis George. Mainline Beginners B: Teacher's Book. Londres: Longman, 1979.

Cita MLA (9th ed.)

Alexander, Louis George. Mainline Beginners B: Teacher's Book. Longman, 1979.