Cita APA (7a ed.)

Nunley, R. E. (1960). The distribution of population in Costa Rica. National Academy of Sciences, National Research Council.

Cita Chicago Style (17a ed.)

Nunley, Robert Edward. The Distribution of Population in Costa Rica. Washington: National Academy of Sciences, National Research Council, 1960.

Cita MLA (9a ed.)

Nunley, Robert Edward. The Distribution of Population in Costa Rica. National Academy of Sciences, National Research Council, 1960.