GRONROOS CHRISTIAN. (1990). SERVICE MANAGEMENT AND MARKETING. LEXINGTON BOOKS.
Chicago Style aipamenaGRONROOS CHRISTIAN. SERVICE MANAGEMENT AND MARKETING. MASSACHUSETTS: LEXINGTON BOOKS, 1990.
MLA aipamenaGRONROOS CHRISTIAN. SERVICE MANAGEMENT AND MARKETING. LEXINGTON BOOKS, 1990.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.