Hise, R. T. (1977). Product/service strategy. Petrocelli/Charter.
Chicago Style aipamenaHise, Richard T. Product/service Strategy. New York: Petrocelli/Charter, 1977.
MLA aipamenaHise, Richard T. Product/service Strategy. Petrocelli/Charter, 1977.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.