Shekhar, S., & Chawla, S. (2003). Spatial databases: A tour. Prentice Hall, ; Pearson Education.
Lua i Stíl Chicago (17ú heag.)Shekhar, Shashi, agus Sanjay Chawla. Spatial Databases: A Tour. Upper Saddle River, N.J. : New Delhi: Prentice Hall, ; Pearson Education, 2003.
Lua MLA (8ú heag.)Shekhar, Shashi, agus Sanjay Chawla. Spatial Databases: A Tour. Prentice Hall, ; Pearson Education, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.