Sheeler, W. D. (1991). Welcome to English: Work Book 3/ Willard D. Sheeler; Susan C.Bayley. Indonesia: English Language Service Inc..
Lua i Stíl Chicago (17ú heag.)Sheeler, Willard D. Welcome to English: Work Book 3/ Willard D. Sheeler; Susan C.Bayley. Indonesia: English Language Service Inc., 1991.
Lua MLA (8ú heag.)Sheeler, Willard D. Welcome to English: Work Book 3/ Willard D. Sheeler; Susan C.Bayley. Indonesia: English Language Service Inc., 1991.
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