APA
Cronbach L. J., . (1949). Essentials of psychological testing. New York: Harper & Brothers.
Chicago
Cronbach Lee J, . 1949. Essentials of psychological testing. New York: Harper & Brothers.
Harvard
Cronbach L. J., . (1949). Essentials of psychological testing. New York: Harper & Brothers.
MLA
Cronbach Lee J, . Essentials of psychological testing. New York: Harper & Brothers. 1949.