Umapathy, K. (1978). Information sources: An international selective guide. Vikas.
Citazione stile Chigago Style (17a edizione)Umapathy, K.S. Information Sources: An International Selective Guide. New Delhi: Vikas, 1978.
Citatione MLA (9a ed.)Umapathy, K.S. Information Sources: An International Selective Guide. Vikas, 1978.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.