Ahmad, N. (1972). Muslim contribution to geography. Sh. Muhammad Ashraf.
芝加哥风格引文Ahmad, Nafis. Muslim Contribution to Geography. Lahore: Sh. Muhammad Ashraf, 1972.
MLA引文Ahmad, Nafis. Muslim Contribution to Geography. Sh. Muhammad Ashraf, 1972.
警告：这些引文格式不一定是100％准确.