Gupta, R. P. (1991). Remote sensing geology. Springer_Verlag.
Lua i Stíl Chicago (17ú heag.)Gupta, Ravi Prakash. Remote Sensing Geology. Hiedelberg, Germany: Springer_Verlag, 1991.
Lua MLA (9ú heag.)Gupta, Ravi Prakash. Remote Sensing Geology. Springer_Verlag, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.