Singh Surender & Parmar Virinder. (2024). General Studies for Civil Services Preliminary Examination: Also useful for State Public Service Commission Examinations Paper-I. Mc Graw Hill.
Chicago-referens (17:e uppl.)Singh Surender och Parmar Virinder. General Studies for Civil Services Preliminary Examination: Also Useful for State Public Service Commission Examinations Paper-I. Chennai: Mc Graw Hill, 2024.
MLA-referens (9:e uppl.)Singh Surender och Parmar Virinder. General Studies for Civil Services Preliminary Examination: Also Useful for State Public Service Commission Examinations Paper-I. Mc Graw Hill, 2024.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.