APA
Chang R. Y. &. K. P. K., . (1993). Step-by-step problem solving : a practical guide to ensure problems get(and stay) solved. A H Wheeler, New Delhi: .
Chicago
Chang Richard Y & Kelly P Keith, . 1993. Step-by-step problem solving : a practical guide to ensure problems get(and stay) solved. A H Wheeler, New Delhi: .
Harvard
Chang R. Y. &. K. P. K., . (1993). Step-by-step problem solving : a practical guide to ensure problems get(and stay) solved. A H Wheeler, New Delhi: .
MLA
Chang Richard Y & Kelly P Keith, . Step-by-step problem solving : a practical guide to ensure problems get(and stay) solved. A H Wheeler, New Delhi: . 1993.