Boehm, R. G., Armstrong, D. G., & Hunkins, F. P. Geography: The world and its people.
芝加哥风格引文Boehm, Richard G., David G. Armstrong, 与 Francis P. Hunkins. Geography: The World and Its People.
MLA引文Boehm, Richard G., et al. Geography: The World and Its People.
警告：这些引文格式不一定是100％准确.