Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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