APA引文

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

Chicago Style (17th ed.) Citation

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

MLA引文

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