Bhattacharyya, D. K. (2006). Researrch methodology. Excel.
Chicago Style aipamenaBhattacharyya, Dipak Kumar. Researrch Methodology. New delhi: Excel, 2006.
MLA aipamenaBhattacharyya, Dipak Kumar. Researrch Methodology. Excel, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.