Crosby, P. B. (1979). Quality is free: The art of making quality certain. New York: McGraw-Hill.
استشهاد بنمط شيكاغوCrosby, Philip B. Quality Is Free: The Art of Making Quality Certain. New York: McGraw-Hill, 1979.
MLA استشهادCrosby, Philip B. Quality Is Free: The Art of Making Quality Certain. New York: McGraw-Hill, 1979.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.