Jan 2023 Issue of the Magazine http://acharya.org/mag/g/g0532.pdf
1960 Book in Tamil, by P B Annangarachariar Swami http://acharya.org/bk/pb/pba/ut.pdf
1905 Book in Telugu http://acharya.org/bk/pb/pl/adr-te.pdf
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.
Article in Tamil by Thirunangur P B Annangarachariar Swami http://acharya.org/ar/tpba/stup.pdf