APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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