Nunley, R. E. (1960). The distribution of population in Costa Rica. National Academy of Sciences, National Research Council.
Lua i Stíl Chicago (17ú heag.)Nunley, Robert Edward. The Distribution of Population in Costa Rica. Washington: National Academy of Sciences, National Research Council, 1960.
Lua MLA (9ú heag.)Nunley, Robert Edward. The Distribution of Population in Costa Rica. National Academy of Sciences, National Research Council, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.