Servi, I. S. (1990). New product development and marketing. Praeger.
Chicago Style aipamenaServi, Italo S. New Product Development and Marketing. New York: Praeger, 1990.
MLA aipamenaServi, Italo S. New Product Development and Marketing. Praeger, 1990.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.