Geography, D. O. (2019). Regional Geography Of North America. Obafemi Awolowo University.
芝加哥风格引文Geography, Department Of. Regional Geography Of North America. Obafemi Awolowo University, 2019.
MLA引文Geography, Department Of. Regional Geography Of North America. Obafemi Awolowo University, 2019.
警告：这些引文格式不一定是100％准确.