Osc Textbooks
Floyd, Malvino, Hazen, Paynter all have sections on Oscillators but these books I have shown are dedicated to the topic.
Below are some pictures of the Barry Davis book. Understanding dc power supplies and oscillators has been a textbook in these units for as long as I remember. Barry Davis was a teacher of electronics at RMIT for many years and this last edition of the textbook was written for the TAFE syllabus.