Παραπομπή σε μορφή APA (7η εκδ.)

Hayes, B. E. (2009). Beyond the ultimate question: A systematic approach to improve customer loyalty. ASQ Quality Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hayes, Bob E. Beyond the Ultimate Question: A Systematic Approach to Improve Customer Loyalty. Milwaukee, Wisconsin: ASQ Quality Press, 2009.

Παραπομπή σε μορφή MLA (9th εκδ.)

Hayes, Bob E. Beyond the Ultimate Question: A Systematic Approach to Improve Customer Loyalty. ASQ Quality Press, 2009.