DeVellis, R. F. (2011). Scale development: Theory and applications (Vol. 26). Los Angeles, CA: SAGE Publications, Inc.
Validation
Douglas, K. A., & Purzer, Ş. (2015). Validity: Meaning and relevancy in assessment for engineering education research. Journal of Engineering Education, 104(2), 108-118.
Messick, S. (1995). Validity of psychological assessment: Validation of inferences from persons' responses and performances as scientific inquiry into score meaning. American Psychologist, 50(9), 741-749.