Prashnopanishad Commentary – Principal Upanishads 2003 Book in English by Dr N S Anantha Rangacharya Swami Translation according to Rangaramanuja Muni http://acharya.org/bk/pb/nsar/pru-pu-nsar.pdf
Kathopanishad Commentary
Kathopanishad Commentary – Principal Upanishads 2003 Book in English by Dr N S Anantha Rangacharya Swami Translation according to Rangaramanuja Muni http://acharya.org/bk/pb/nsar/kau-pu-nsar.pdf
Kenopanishad Commentary
Kenopanishad Commentary Principal Upanishads 2003 Book in English by Dr N S Anantha Rangacharya Swami Based on the comentary of Rangaramanuja Muni http://acharya.org/bk/pb/nsar/keu-pu-nsar.pdf
Isavasya Upanishad Commentary
2003 Book in English by Dr N S Anantha Rangacharya Swami http://acharya.org/bk/pb/nsar/isu-pu-nsar.pdf
Periyazhvar Thirumozhi Aindham Paththu – Svapadesam, Vyakhyanam, Arumpadam
Commentary in Mani PravalamSvapadesam by Thiruvaymozhi PillaiVyakhyanam by Manavala Mamunigal and Periyavachchan PillaiArumpadam http://acharya.org/bk/pb/tvmp/ptm-sva-5.pdf