Cita APA (7a ed.)

SHEELER, W. D. (1991). WELCOME TO ENGLISH BOOK 6. OXPORD UNIVERSITY PRESS.

Cita Chicago Style (17a ed.)

SHEELER, WILLARD D. WELCOME TO ENGLISH BOOK 6. OXPORD UNIVERSITY PRESS, 1991.

Cita MLA (8a ed.)

SHEELER, WILLARD D. WELCOME TO ENGLISH BOOK 6. OXPORD UNIVERSITY PRESS, 1991.