Yorkey, R. (1970). A Study Skills Course for Foreign College Students.
Citazione stile Chigago Style (17a edizione)Yorkey, Richard. A Study Skills Course for Foreign College Students. 1970.
Citatione MLA (9a ed.)Yorkey, Richard. A Study Skills Course for Foreign College Students. 1970.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.