APA (7th ed.) Citation

Harrison, J., & Menzies, P. (1986). Orbit: Workbook 2A : lessons 1-44 (1ª ed.).

Chicago Style (17th ed.) Citation

Harrison, Jeremy, and Peter Menzies. Orbit: Workbook 2A : Lessons 1-44. 1ª ed. Oxford, 1986.

MLA (9th ed.) Citation

Harrison, Jeremy, and Peter Menzies. Orbit: Workbook 2A : Lessons 1-44. 1ª ed. 1986.