According to Chapter 2, what other authors had written about Sai Baba before this text, and what were their works called?

Chapter 2 explains that several other authors had already documented Sai Baba's life and teachings. For instance, Das Ganu wrote two books, *Bhakta-Lilamrut* and *Santa-Kathamrut*. The former contains three chapters on Shri Sai's life, while the latter includes a knowledge-story from Sai in Chapter 57. The chapter also mentions Raghunath-Savitri’s *Bhajanmala*, miscellaneous poems by Das Ganu, works for Gujarati devotees by Amidas and Bhavani Metha, and a series of stories published in Pune under the name *Sai Prabha*. This context is provided to address why a new book was necessary.