Citazione Stile APA (7a Edizione)

Yorkey, R. C. (1970). Study skills for students of english as a second language. McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Yorkey, Richard C. Study Skills for Students of English as a Second Language. Nueva York: McGraw-Hill, 1970.

Citatione MLA (9a ed.)

Yorkey, Richard C. Study Skills for Students of English as a Second Language. McGraw-Hill, 1970.