J K Chopra. (2013). Unique Quintessence of General Studies Paper-1 2013: Must read manual for UPSC/ State civil services preliminary examination. New Delhi.
استشهاد بنمط شيكاغوJ K Chopra. Unique Quintessence of General Studies Paper-1 2013: Must Read Manual for UPSC/ State Civil Services Preliminary Examination. New Delhi, 2013.
MLA استشهادJ K Chopra. Unique Quintessence of General Studies Paper-1 2013: Must Read Manual for UPSC/ State Civil Services Preliminary Examination. New Delhi, 2013.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.