APA (7e ed.) Bronvermelding

Crosby, P. B. (1979). Quality is free: The art of making quality certain. McGraw-Hill.

Chicago (17e ed.) Bronvermelding

Crosby, Philip B. Quality Is Free: The Art of Making Quality Certain. New York: McGraw-Hill, 1979.

MLA (9e ed.) Bronvermelding

Crosby, Philip B. Quality Is Free: The Art of Making Quality Certain. McGraw-Hill, 1979.