External Sources
Parma Bhattaraka Sree Chattampi Swamikal:
Collection of books and articles by an on Chattami Swamikal developed by Sreyas Foundation.
Panmana Asram:
Chattampi Swamikal- Wikipedia
Select Books of Chattampi Swamikal
Books of Chattampi Swamikal for Download maintained by malaylambooks.org