His book "Krishna Caitanya" is approved and authoritative
Correspondence
1967 Correspondence
Late Prof. N. K. Sanyal was my Godbrother and his book Krishna Caitanya is approved and authoritative.
Letter to Brahmananda -- San Francisco 14 March, 1967: I am glad to learn that Donald has purchased Prof. Sanyal's book Krishna Caitanya. Late Prof. N. K. Sanyal was my Godbrother and his book Krishna Caitanya is approved and authoritative. Keep it very carefully and we may publish in Back to Godhead some articles from the book. It will help us a great deal because my Spiritual Master has given His approval to this book.* Please keep it carefully and when I return I shall see to it.