Surender Singh. (2019). General Studies Paper I for Civil Services Preliminary Examination. McGraw Hill Education Pvt Ltd.
シカゴスタイル引用形Surender Singh. General Studies Paper I for Civil Services Preliminary Examination. Chennai: McGraw Hill Education Pvt Ltd, 2019.
MLA引用形式Surender Singh. General Studies Paper I for Civil Services Preliminary Examination. McGraw Hill Education Pvt Ltd, 2019.
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