Cita APA (7th ed.)

Gutkind, E. A., & Gutkind, G. (1972). Urban development in East-Central Europe: Bulgaria, Romania, and the U.S.S.R. Free Press.

Cita Chicago (17th ed.)

Gutkind, Erwin Anton, i Gabriele Gutkind. Urban Development in East-Central Europe: Bulgaria, Romania, and the U.S.S.R. New York: Free Press, 1972.

Cita MLA (9th ed.)

Gutkind, Erwin Anton, i Gabriele Gutkind. Urban Development in East-Central Europe: Bulgaria, Romania, and the U.S.S.R. Free Press, 1972.