APA Citatie

Chappell, M. N. (1949). Worry and its control. New York, N.Y.: Collier Books.

Chicago Style citaat

Chappell, Matthew N. Worry and Its Control. New York, N.Y.: Collier Books, 1949.

MLA citatie

Chappell, Matthew N. Worry and Its Control. New York, N.Y.: Collier Books, 1949.

Let op: Deze citaties zijn niet altijd 100% accuraat.