APA استشهاد

R.Nandagopal. (2007). Research methods in business. Excel Books.

استشهاد بنمط شيكاغو

R.Nandagopal. Research Methods in Business. New Delhi: Excel Books, 2007.

MLA استشهاد

R.Nandagopal. Research Methods in Business. Excel Books, 2007.