حول بین (Urdu Wikipedia)

Analysis of information sources in references of the Wikipedia article "حول بین" in Urdu language version.

refsWebsite

Global rank Urdu rank

2books.google.com

3^rd place

3^rd place

books.google.com

Walker, Bruce H. (2000)۔ Optical Design for Visual Systems۔ SPIE Press۔ ص 117۔ ISBN:978-0-8194-3886-7
The Submarine Periscope: An Explanation of the Principles Involved in Its Construction, Together with a Description of the Main Features of the Barr and Stroud Periscopes۔ Barr and Stroud Limited۔ 1928