Cita APA (7a ed.)

Van Ek, J., Fitzpatrick, M., & Alexander, L. (1982). Waystage english: An intermediary objective below Threshold level in a european unit/credit system of modern language learning by adults. Pergamon press.

Cita Chicago Style (17a ed.)

Van Ek, J.A, M.A Fitzpatrick, y L.G Alexander. Waystage English: An Intermediary Objective Below Threshold Level in a European Unit/credit System of Modern Language Learning by Adults. Oxford [etc.]: Pergamon press, 1982.

Cita MLA (9a ed.)

Van Ek, J.A, et al. Waystage English: An Intermediary Objective Below Threshold Level in a European Unit/credit System of Modern Language Learning by Adults. Pergamon press, 1982.