Gaya APA
Surapranata, S. et al (2006).
Methods in educational research: from theory to practice .
San Francsco:
Jossey-Bass Publishers.
Gaya MLA
Surapranata, Sumarna. et al.
"Methods in educational research: from theory to practice".
San Francsco:
Jossey-Bass Publishers,
2006.
Text.