Caves & Roberts. (1975). Regulating the product: Quality and variety. Ballinger.
Chicago Style aipamenaCaves and Roberts. Regulating the Product: Quality and Variety. USA: Ballinger, 1975.
MLA aipamenaCaves and Roberts. Regulating the Product: Quality and Variety. Ballinger, 1975.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.