Cita APA (7a ed.)

Gappert, G., & Knight, R. V. (1982). Cities in the 21st century Urban affairs annual reviews.

Cita Chicago Style (17a ed.)

Gappert, Gary, y Richard V. Knight. "Cities in the 21st Century." Urban Affairs Annual Reviews 1982.

Cita MLA (9a ed.)

Gappert, Gary, y Richard V. Knight. "Cities in the 21st Century." Urban Affairs Annual Reviews, 1982.