Chang, R. Y., & Kelly, P. K. (1994). Satisfying internal customers first: A practical guide to improving internal and external customer satisfaction. Richard Chang Associates.
Chicago-viite (17. p.)Chang, Richard Y., ja P. Keith Kelly. Satisfying Internal Customers First: A Practical Guide to Improving Internal and External Customer Satisfaction. Irvine, Calif: Richard Chang Associates, 1994.
MLA-viite (9. p.)Chang, Richard Y., ja P. Keith Kelly. Satisfying Internal Customers First: A Practical Guide to Improving Internal and External Customer Satisfaction. Richard Chang Associates, 1994.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.