Cita APA (7a ed.)

Alexander, L., & Kingsbury, R. (1976). Mainline skills A: V.2: Achievement texts 1 & 2 (1st edition.). Longman.

Cita Chicago Style (17a ed.)

Alexander, L.G, y R.H Kingsbury. Mainline Skills A: V.2: Achievement Texts 1 & 2. 1st edition. London: Longman, 1976.

Cita MLA (8a ed.)

Alexander, L.G, y R.H Kingsbury. Mainline Skills A: V.2: Achievement Texts 1 & 2. 1st edition. Longman, 1976.