Parminder Singh Grover, Davinderjit Singh, Photographs by Bhupinder Singh: Discover Punjab: Attractions of Punjab. Golden Point Pvt Lmt., Ludhiana, Punjab, India 2011, Section 1: Introduction – Regions of Punjab (englisch, google.com): “Doaba: The rivers Sutlei in the south and Beas in the North bound the Doaba of Puniab. The Doaba region is divided into four districts: 1. Jalandhar, 2. Nawanshahr, 3. Kapurthala, 4. Hoshiarpur.”
