APA (7. basım) Alıntı

Sheeler, W. D. (1991). WELCOME TO ENGLISH BOOK 4. English Language Service.

Chicago Style (17. basım) Atıf

Sheeler, Willard D. WELCOME TO ENGLISH BOOK 4. English Language Service, 1991.

MLA (8th ed.) Atıf

Sheeler, Willard D. WELCOME TO ENGLISH BOOK 4. English Language Service, 1991.