APA (7th ed.) Citation

Richards, J. C. Interchange. English for international communication. Intro Workbook.

Chicago Style (17th ed.) Citation

Richards, Jack C. Interchange. English for International Communication. Intro Workbook.

MLA (8th ed.) Citation

Richards, Jack C. Interchange. English for International Communication. Intro Workbook.

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