APA (7th ed.) Citation

Gray Joanna. (1992). Discovering English: A pre-intermediate course. Prentice Hall.

Chicago Style (17th ed.) Citation

Gray Joanna. Discovering English: A Pre-intermediate Course. Prentice Hall, 1992.

MLA (8th ed.) Citation

Gray Joanna. Discovering English: A Pre-intermediate Course. Prentice Hall, 1992.

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