GUPTA A P. (1987). BUSINESS STATISTICS (6.). SULTAN CHAND AND SONS.
Lua i Stíl Chicago (17ú heag.)GUPTA A P. BUSINESS STATISTICS. 6. NEW DELHI: SULTAN CHAND AND SONS, 1987.
Lua MLA (9ú heag.)GUPTA A P. BUSINESS STATISTICS. 6. SULTAN CHAND AND SONS, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.