Babbie, E. (2017). Basics of social research (7th ed.). Boston, MA: Cengage Learning.
· Chapter 5, “Conceptualization, Operationalization, and Measurement”
Burkholder, G. J., Cox, K. A., & Crawford, L. M. (2016). The scholar-practitioner’s guide to research design. Baltimore, MD: Laureate Publishing.
· Chapter 4, “Quantitative Research Designs”
Laureate Education (Producer). (2009d). Quantitative methods: An example [Video file]. Baltimore, MD: Author.