Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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