Open University Course Team. (1976). Approximation I and II.Units 9 and 10 (4th ed.). Open uty press.
Chicago Edition CitationOpen University Course Team. Approximation I and II.Units 9 and 10. 4th ed. Open uty press, 1976.
MLA Edition CitationOpen University Course Team. Approximation I and II.Units 9 and 10. 4th ed. Open uty press, 1976.
Warning: These citations may not always be 100% accurate.