In order to understand and learn more about Soruth philately, having a collection of valuable reference books is essential. Below are some recommended reference books I think every Soruth stamp collector should consider adding to their library.
Soruth
Author: Wood, Ron and Meher, Vijay
Publisher: India Study Circle for Philately, 1999
Handbook of Indian Philately, Second Series No. 3, large paperback, illustrated, x + 163 pages. Well illustrated in black & white.
SORATH Stamps and Postal History
Author: R. A. Malaviya
Publisher: Ravi Prakashan, Junagadh, 1999
(Note: This list will be updated as and when I discover new reference books or resources)