Gutkind, E. A., & Gutkind, G. (1972). Urban development in East-Central Europe: Bulgaria, Romania, and the U.S.S.R. Free Press.
Lua i Stíl Chicago (17ú heag.)Gutkind, Erwin Anton, agus Gabriele Gutkind. Urban Development in East-Central Europe: Bulgaria, Romania, and the U.S.S.R. New York: Free Press, 1972.
Lua MLA (9ú heag.)Gutkind, Erwin Anton, agus Gabriele Gutkind. Urban Development in East-Central Europe: Bulgaria, Romania, and the U.S.S.R. Free Press, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.