APA
(1990). Sample question papers senior school certificate examinations: Class 12th for examination 1991 and onward. Vol 2. Delhi, India: Central Board of Secondary Education.
Chicago
1990. Sample question papers senior school certificate examinations: Class 12th for examination 1991 and onward. Vol 2. Delhi, India: Central Board of Secondary Education.
Harvard
(1990). Sample question papers senior school certificate examinations: Class 12th for examination 1991 and onward. Vol 2. Delhi, India: Central Board of Secondary Education.
MLA
Sample question papers senior school certificate examinations: Class 12th for examination 1991 and onward. Vol 2. Delhi, India: Central Board of Secondary Education. 1990.
