Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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