Fraenkel, J. R., & Wallen, N. E. (2019). How to design and evaluate research in education. McGraw-Hill.
Chicago-referens (17:e uppl.)Fraenkel, Jack R., och Norman E. Wallen. How to Design and Evaluate Research in Education. Boston: McGraw-Hill, 2019.
MLA-referens (9:e uppl.)Fraenkel, Jack R., och Norman E. Wallen. How to Design and Evaluate Research in Education. McGraw-Hill, 2019.