Khullar, D. (2018). Indian and world geography for civil services preliminary examination. CL Media.
芝加哥风格引文Khullar, D.R. Indian and World Geography for Civil Services Preliminary Examination. Roorkee: CL Media, 2018.
MLA引文Khullar, D.R. Indian and World Geography for Civil Services Preliminary Examination. CL Media, 2018.
警告：这些引文格式不一定是100％准确.