Landis, P. H. (1948). Population problems: A cultural interpretation. American Book Company.
芝加哥风格引文Landis, Paul Henry. Population Problems: A Cultural Interpretation. New York: American Book Company, 1948.
MLA引文Landis, Paul Henry. Population Problems: A Cultural Interpretation. American Book Company, 1948.
警告：这些引文格式不一定是100％准确.