Nelson, J. L. (1977). Population and progress: Is there a conflict? (2ª ed.). Prentice Hall.
芝加哥风格引文Nelson, Jack L. Population and Progress: Is There a Conflict? 2ª ed. Prentice Hall, 1977.
MLA引文Nelson, Jack L. Population and Progress: Is There a Conflict? 2ª ed. Prentice Hall, 1977.
警告：这些引文格式不一定是100％准确.