APA (7th ed.) Zitazioa
Gopalakrishna, D. (2010). Electronic marketing in 21st century (Rev. ed.). Himalaya Pub. House.
Chicago Style (17th ed.) Zitazioa
Gopalakrishna, D. Electronic Marketing in 21st Century. Rev. ed. Mumbai: Himalaya Pub. House, 2010.
MLA (9th ed.) Zitazioa
Gopalakrishna, D. Electronic Marketing in 21st Century. Rev. ed. Himalaya Pub. House, 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.