Azar, b. s. (1993). Understanding and using english grammar. Binarupa Aksara.
Chicago Style aipamenaAzar, betty schrampher. Understanding and Using English Grammar. Binarupa Aksara, 1993.
MLA aipamenaAzar, betty schrampher. Understanding and Using English Grammar. Binarupa Aksara, 1993.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.