In the preface, does the author Balkrishna Vishwanath Dev mention any other Gurus he followed or admired besides Shri Sai Baba?

The provided excerpts from the preface do not mention any other Gurus that the author, Balkrishna Vishwanath Dev, followed or admired by name. The text is focused on the overarching importance of the Sadguru figure. In Chapter 0, the author makes a strong case that the 'best and most certain service' that grants salvation is to write the biography of 'one's Sadguru.' He does not name any other personal Gurus but instead quotes Dnyaneshwar Maharaj and emphasizes the principle of surrendering at the feet of the saints to gain enlightenment, without specifying any saints other than the implied subject of the main work, Sai Baba.