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
Srivachana Bhushanam Moolam
Book in Tamil http://acharya.org/bk/pb/pl/svbm.pdf
Acharya Hrudayam – Vyakhyanam, Pratipadam, Arumpadam and Pramana Thirattu
1906 Book http://acharya.org/bk/pb/Vyakhyanam/ahvap.pdf
Kooraththazhvan Vaibhavam
1919 Book in Tamil, by Sri U Ve P B Annangarachariar Swami http://acharya.org/bk/pb/pba/kav-pba.pdf