APA (7th ed.) Citation

D.Sheeler, W. (1990). Welcome to english: Guidebook. English Language Services.

Chicago Style (17th ed.) Citation

D.Sheeler, Willard. Welcome to English: Guidebook. English Language Services, 1990.

MLA (8th ed.) Citation

D.Sheeler, Willard. Welcome to English: Guidebook. English Language Services, 1990.

Warning: These citations may not always be 100% accurate.