Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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