Cita APA (7a ed.)

Geist, H., & Webb, D. E. (1968). The psychological aspects of retirement. Charles C. Thomas.

Cita Chicago Style (17a ed.)

Geist, Harold, y Del E. Webb. The Psychological Aspects of Retirement. Springfield, Illinois: Charles C. Thomas, 1968.

Cita MLA (9a ed.)

Geist, Harold, y Del E. Webb. The Psychological Aspects of Retirement. Charles C. Thomas, 1968.