Gennard, J. (1976). Economic and technologicl environments 3. Open University Press.
Chicago Style aipamenaGennard, John. Economic and Technologicl Environments 3. England: Open University Press, 1976.
MLA aipamenaGennard, John. Economic and Technologicl Environments 3. Open University Press, 1976.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.