Christopherson, R. W. (2006). Geosystems (Custom edition for Georgia State University.). Pearson Custom Publishing.
芝加哥风格引文Christopherson, Robert W. Geosystems. Custom edition for Georgia State University. Boston, Ma: Pearson Custom Publishing, 2006.
MLA引文Christopherson, Robert W. Geosystems. Custom edition for Georgia State University. Pearson Custom Publishing, 2006.
警告：这些引文格式不一定是100％准确.