APA (7th ed.) Citation

Chapman, E. N. (1993). Comfort zones: Planning your future (3rd ed.). Crisp Pub.

Chicago Style (17th ed.) Citation

Chapman, Elwood N. Comfort Zones: Planning Your Future. 3rd ed. Menlo Park, Calif: Crisp Pub, 1993.

MLA (9th ed.) Citation

Chapman, Elwood N. Comfort Zones: Planning Your Future. 3rd ed. Crisp Pub, 1993.