WARD JOHN. (1984). PROFITABLE PRODUCT MANAGEMENT. HEINEMANN.
Chicago Style aipamenaWARD JOHN. PROFITABLE PRODUCT MANAGEMENT. LONDON: HEINEMANN, 1984.
MLA aipamenaWARD JOHN. PROFITABLE PRODUCT MANAGEMENT. HEINEMANN, 1984.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.