Please make sure one of the references is
Bordens, K. S. & Abbot, B. B. (2022). Research design and methods: A process approach (11th ed.). New York, NY: McGraw Hill Education.
Chapter 7: Choosing and Using Research Subjects
In this discussion, let’s discuss the problem of volunteerism in research using human participants. Write 1-2 paragraphs explaining how volunteers and non-volunteers differ, how those differences may affect the outcome of research, and how the problem of volunteerism can be reduced.