What Is The Path Of The Masters?
To come to an accurate understanding of Sant Mat (The Path of the Masters), these two online books are extremely helpful.
For the bhakti element, the Path of Love for the Beloved, see, Songs of Kabir:
For the esoteric teachings, the detailed, clear and complete explanation of the goals of Sant Mat Mysticism — Inner Light and Sound Meditation, see the following:
Sant Mat: The Philosophy of Liberation