Cita APA (7th ed.)

Alexander, L. G. (1976). Developing skills: An integrated course for intermediate students. Longman.

Cita Chicago (17th ed.)

Alexander, Louis George. Developing Skills: An Integrated Course for Intermediate Students. Londres: Longman, 1976.

Cita MLA (9th ed.)

Alexander, Louis George. Developing Skills: An Integrated Course for Intermediate Students. Longman, 1976.