1960 Book in Tamil, by P B Annangarachariar Swami http://acharya.org/bk/pb/pba/ut.pdf
Ashtadasha Rahasyangal in Telugu Lipi
1905 Book in Telugu http://acharya.org/bk/pb/pl/adr-te.pdf
Mumukshuppadi Commentary – Thirumantra Prakaranam: English Translation
2023 Book in English, by TCA Venkatesan Available as Kindle Book & Paperback Print Book on Amazon Kindle Book available for free download tomorrow Mar 6, 2023 during US PST Hours.
Stotra Ratnam – Periyavachchanpillai Vyakhyanam
1878 Book in Tamil http://acharya.org/bk/pb/PAP/srv-pp.pdf
Ramanuja on the Yoga
1976 Book in English, by Dr Robert C Lester http://acharya.org/bk/pb/rel/roty.pdf