Cita APA (7a ed.)

Willet, A. H. (1901). The economic theory of risk and insurance. Columbia University Press.

Cita Chicago Style (17a ed.)

Willet, Allan Herbert. The Economic Theory of Risk and Insurance. New York: Columbia University Press, 1901.

Cita MLA (9a ed.)

Willet, Allan Herbert. The Economic Theory of Risk and Insurance. Columbia University Press, 1901.