Gaya APA
BALL, S. (1981).
New Directions For Program Evaluation : Assessing And Interpreting Outcomes (1).
San Fransisco:
Jossey-Bass Inc.
Gaya MLA
BALL, SAMUEL.
"New Directions For Program Evaluation : Assessing And Interpreting Outcomes".
1
San Fransisco:
Jossey-Bass Inc,
1981.
Text.