Sheeler, W. D. (1991). Welcome to English: Work Book 3/ Willard D. Sheeler; Susan C.Bayley. Indonesia: English Language Service Inc..
Chicago-viite (17. p.)Sheeler, Willard D. Welcome to English: Work Book 3/ Willard D. Sheeler; Susan C.Bayley. Indonesia: English Language Service Inc., 1991.
MLA-viite (8. p.)Sheeler, Willard D. Welcome to English: Work Book 3/ Willard D. Sheeler; Susan C.Bayley. Indonesia: English Language Service Inc., 1991.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.