APA (7th ed.) Citation

Engel, H. M. (1983). How to delegate: A guide to getting things done. Gulf Pub. Co..

Chicago Style (17th ed.) Citation

Engel, Herbert M. How to Delegate: A Guide to Getting Things Done. Houston, Tex.: Gulf Pub. Co., 1983.

MLA (9th ed.) Citation

Engel, Herbert M. How to Delegate: A Guide to Getting Things Done. Gulf Pub. Co., 1983.