Nunley, R. E. (1960). The distribution of population in Costa Rica. National Academy of Sciences, National Research Council.
芝加哥风格引文Nunley, Robert Edward. The Distribution of Population in Costa Rica. Washington: National Academy of Sciences, National Research Council, 1960.
MLA引文Nunley, Robert Edward. The Distribution of Population in Costa Rica. National Academy of Sciences, National Research Council, 1960.
警告：这些引文格式不一定是100％准确.