APA
(1979). Syllabi and courses for all India secondary school examination 1981 (classes 9th and 10th). New Delhi, India: Central Board of Secondary Education.
Chicago
1979. Syllabi and courses for all India secondary school examination 1981 (classes 9th and 10th). New Delhi, India: Central Board of Secondary Education.
Harvard
(1979). Syllabi and courses for all India secondary school examination 1981 (classes 9th and 10th). New Delhi, India: Central Board of Secondary Education.
MLA
Syllabi and courses for all India secondary school examination 1981 (classes 9th and 10th). New Delhi, India: Central Board of Secondary Education. 1979.
