Style de citation APA

Open University Course Team. (1976). Approximation I and II.Units 9 and 10 (5th ed.). Open uty press.

Style de citation Chicago

Open University Course Team. Approximation I and II.Units 9 and 10. 5th ed. Open uty press, 1976.

Style de citation MLA

Open University Course Team. Approximation I and II.Units 9 and 10. 5th ed. Open uty press, 1976.