APA (7th ed.) Citation

Gorrell, R. M. (1963). Modern english workbook (2.). Prentice-Hall.

Chicago Style (17th ed.) Citation

Gorrell, Robert M. Modern English Workbook. 2. Estados Unidos: Prentice-Hall, 1963.

MLA (9th ed.) Citation

Gorrell, Robert M. Modern English Workbook. 2. Prentice-Hall, 1963.

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