Fraenkel, J. R., & Wallen, N. E. (2009). How to design and evaluate research in education (7th ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Fraenkel, Jack R., agus Norman E. Wallen. How to Design and Evaluate Research in Education. 7th ed. New York, NY: McGraw-Hill, 2009.
Lua MLA (8ú heag.)Fraenkel, Jack R., agus Norman E. Wallen. How to Design and Evaluate Research in Education. 7th ed. McGraw-Hill, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.