APA (7th ed.) Citation

Gray, L. S. (1999). Mastering idiomatic English. National Textbook.

Chicago Style (17th ed.) Citation

Gray, Loretta S. Mastering Idiomatic English. National Textbook, 1999.

MLA (8th ed.) Citation

Gray, Loretta S. Mastering Idiomatic English. National Textbook, 1999.

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