Miller, R. B., & Johnson, L. N. (Eds.). (2014). Advanced methods in family therapy research: A focus on validity and change (1st ed.). Routledge. This resource will help with an understanding of basic research methods. Specific chapters are not assigned; this is an excellent overall reference to refer to as needed.
Landrum, B., & Garza, G. (2015). Mending fences: Defining the domains and approaches of quantitative and qualitative research. Qualitative Psychology, 2(2), 199–209. This resource will help with understanding of qualititative and quantitative approaches.
Korstjens, I., & Moser, A. (2018). Series: Practical guidance to qualitative research. Part 4: Trustworthiness and publishing. The European Journal of General Practice, 24(1), 120–124. This resource will help with understanding the concept of trustworthiness.