Referensi
DeVellis, R. F. (2012). Scale Development: Theory and Applications (3rd ed.). Thousand Oaks, CA: Sage Publications.
Arikunto, S. (2010). Dasar-dasar evaluasi pendidikan. Jakarta: Bumi Aksara.
Creswell, J. W. (2014). Research design: Qualitative, quantitative, and mixed methods approaches (4th ed.). Thousand Oaks, CA: Sage Publications.
Sekaran, U., & Bougie, R. (2016). Research methods for business: A skill building approach (7th ed.). West Sussex, UK: John Wiley & Sons, Ltd.
Rossi, P. H., Lipsey, M. W., & Freeman, H. E. (2004). Evaluation: A systematic approach (7th ed.). Thousand Oaks, CA: Sage Publications.
Scriven, M. (1991). Evaluation thesaurus (4th ed.). Newbury Park, CA: Sage Publications.
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