Van Dalen, D. B. (1979). Understanding educational research: An introduction (Fourth edition.). McGraw-Hill Book Company.
Citazione stile Chigago Style (17a edizione)Van Dalen, Deobold B. Understanding Educational Research: An Introduction. Fourth edition. New York [i pozostałe]: McGraw-Hill Book Company, 1979.
Citatione MLA (9a ed.)Van Dalen, Deobold B. Understanding Educational Research: An Introduction. Fourth edition. McGraw-Hill Book Company, 1979.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.