Crosby, P. B. (1979). Quality is free: The art of making quality certain. New York: A Mentor Book.
शिकागो स्टाइल उद्धरणCrosby, Philip B. Quality Is Free: The Art of Making Quality Certain. New York: A Mentor Book, 1979.
एमएलए उद्धरणCrosby, Philip B. Quality Is Free: The Art of Making Quality Certain. New York: A Mentor Book, 1979.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.