APA (7th ed.) Citation

Whitehead, D., & Whitehead, G. (1993). English for business. Made Simple.

Chicago Style (17th ed.) Citation

Whitehead, David, and Geoffrey Whitehead. English for Business. Oxford: Made Simple, 1993.

MLA (8th ed.) Citation

Whitehead, David, and Geoffrey Whitehead. English for Business. Made Simple, 1993.

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