Cita APA (7a ed.)

Hellman, H. (1970). The city: In the world of the future. M. Evans.

Cita Chicago Style (17a ed.)

Hellman, Hal. The City: In the World of the Future. New York: M. Evans, 1970.

Cita MLA (9a ed.)

Hellman, Hal. The City: In the World of the Future. M. Evans, 1970.