Singh, G. (2000). Map work and practical geography (4th ed.). Vikas.
Chicago-čujuhus (17. p.)Singh, Gopal. Map Work and Practical Geography. 4th ed. New Delhi: Vikas, 2000.
MLA-čujuhus (9. p.)Singh, Gopal. Map Work and Practical Geography. 4th ed. Vikas, 2000.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.