Fraenkel, J. R., & Jack R. Fraenkel; Norman E. Wallen. (2006). How to design and evaluate research in education. Boston: McGraw-Hill.
Παραπομπή Chicago StyleFraenkel, Jack R., και Jack R. Fraenkel; Norman E. Wallen. How to Design and Evaluate Research in Education. Boston: McGraw-Hill, 2006.
Παραπομπή MLAFraenkel, Jack R., και Jack R. Fraenkel; Norman E. Wallen. How to Design and Evaluate Research in Education. Boston: McGraw-Hill, 2006.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.