Cita APA

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

Chicago Style Citation

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

Cita MLA

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

Atenció: Aquestes cites poden no estar 100% correctes.