Esler, A. (1986). The human venture: The globe encompassed. Prentice-Hall.
Cita Chicago (17th ed.)Esler, Anthony. The Human Venture: The Globe Encompassed. New Jersey: Prentice-Hall, 1986.
Cita MLA (9th ed.)Esler, Anthony. The Human Venture: The Globe Encompassed. Prentice-Hall, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.