Gary Armstrong & Philip Kotler. (2003). Marketing (Ed-6.). Pearson.
Chicago Style aipamenaGary Armstrong and Philip Kotler. Marketing. Ed-6. New Delhi: Pearson, 2003.
MLA aipamenaGary Armstrong and Philip Kotler. Marketing. Ed-6. Pearson, 2003.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.