APA

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

Chicago

S. Gray, . 1999. Mastering idiomatic English. : National Textbook Company.

Harvard

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

MLA

S. Gray, . Mastering idiomatic English. : National Textbook Company. 1999.