Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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