APA (7e ed.) Bronvermelding

Sheeeler, W. D. (1991). Welcome to English 6: Buku Penuntun/ Willard D Sheeeler. Indonesia : Inglish Language S. Inc.

Chicago (17e ed.) Bronvermelding

Sheeeler, Willard D. Welcome to English 6: Buku Penuntun/ Willard D Sheeeler. Indonesia : Inglish Language S. Inc, 1991.

MLA (8e ed.) Bronvermelding

Sheeeler, Willard D. Welcome to English 6: Buku Penuntun/ Willard D Sheeeler. Indonesia : Inglish Language S. Inc, 1991.