Betts, G. H. (1971). The mind and its education. Northern University.
Citazione stile Chigago Style (17a edizione)Betts, George H. The Mind and Its Education. Evanston: Northern University, 1971.
Citatione MLA (9a ed.)Betts, George H. The Mind and Its Education. Northern University, 1971.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.