Gaya APA

Chen, H. (2005). Practical program evaluation: assesing and improving planning, implemantion, and effectiveness . Thousand Oaks, California: SAGE Publications.

Gaya MLA

Chen, Huey-Tsyh. "Practical program evaluation: assesing and improving planning, implemantion, and effectiveness". Thousand Oaks, California: SAGE Publications, 2005. Text.