Sheeeler, W. D. (1991). Welcome to English 6: Buku Penuntun/ Willard D Sheeeler. Indonesia : Inglish Language S. Inc.
Lua i Stíl Chicago (17ú heag.)Sheeeler, Willard D. Welcome to English 6: Buku Penuntun/ Willard D Sheeeler. Indonesia : Inglish Language S. Inc, 1991.
Lua MLA (8ú heag.)Sheeeler, Willard D. Welcome to English 6: Buku Penuntun/ Willard D Sheeeler. Indonesia : Inglish Language S. Inc, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.