APA

Surender Singh (ed.), Virinder Parmar (ed.), . (2017). General studies for civil services preliminary examination : GS paper I (2017). : McGraw Hill Education (india).

Chicago

Surender Singh (ed.), Virinder Parmar (ed.), . 2017. General studies for civil services preliminary examination : GS paper I (2017). : McGraw Hill Education (india).

Harvard

Surender Singh (ed.), Virinder Parmar (ed.), . (2017). General studies for civil services preliminary examination : GS paper I (2017). : McGraw Hill Education (india).

MLA

Surender Singh (ed.), Virinder Parmar (ed.), . General studies for civil services preliminary examination : GS paper I (2017). : McGraw Hill Education (india). 2017.