Chang, R. Y., & Kelly, P. K. (1993). Step-by-step problem solving: A practical guide to ensure problems get (and stay) solved. Kogan Page.
Chicago Style (17. basım) AtıfChang, Richard Y., ve P. Keith Kelly. Step-by-step Problem Solving: A Practical Guide to Ensure Problems Get (and Stay) Solved. London: Kogan Page, 1993.
MLA (9th ed.) AtıfChang, Richard Y., ve P. Keith Kelly. Step-by-step Problem Solving: A Practical Guide to Ensure Problems Get (and Stay) Solved. Kogan Page, 1993.
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