Gaya APA

Friedman, M. (2009). Trying Hard is Not Good Enough: How to Produce Measurable Improvements for Customers and Communities . Australia: Booksurge.

Gaya MLA

Friedman, Mark. "Trying Hard is Not Good Enough: How to Produce Measurable Improvements for Customers and Communities". Australia: Booksurge, 2009. Textbook.