Gupta, V. D. (1998). Marketing mantra: The real story of direct marketing in India. Prentice Hall.
Chicago Style aipamenaGupta, Vasuar Das. Marketing Mantra: The Real Story of Direct Marketing in India. New Delhi: Prentice Hall, 1998.
MLA aipamenaGupta, Vasuar Das. Marketing Mantra: The Real Story of Direct Marketing in India. Prentice Hall, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.