(1999). UPSC (IES) Engineering Services Examination Papers: Solved and Unsolved in General Studies. G.K.
シカゴスタイル引用形UPSC (IES) Engineering Services Examination Papers: Solved and Unsolved in General Studies. Jabalpur: G.K, 1999.
MLA引用形式UPSC (IES) Engineering Services Examination Papers: Solved and Unsolved in General Studies. G.K, 1999.
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