APA-viite (7. p.)

Friedman, M. (2005). Trying hard is not good enough: How to produce measurable improvements for customers and communities. FPSI Publishing.

Chicago-viite (17. p.)

Friedman, Mark. Trying Hard Is Not Good Enough: How to Produce Measurable Improvements for Customers and Communities. Victoria, B.C.: FPSI Publishing, 2005.

MLA-viite (8. p.)

Friedman, Mark. Trying Hard Is Not Good Enough: How to Produce Measurable Improvements for Customers and Communities. FPSI Publishing, 2005.