Ulich, R. (1950). History of educational thought. American Book Company.
Citazione stile Chigago Style (17a edizione)Ulich, Robert. History of Educational Thought. New York, Cincinnati: American Book Company, 1950.
Citatione MLA (9a ed.)Ulich, Robert. History of Educational Thought. American Book Company, 1950.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.