Minor typo, no comma...
Lessons in Electric Circuits, Volume 3, chapter 8, Positive Feedback
I don't know how I missed this one.
Also, could we add this cross reference...CROSS-REFERENCES
Lessons In Electric CircuitsVolume 1, chapter 16: Voltage and current calculations
Lessons In Electric Circuits, Volume 1, chapter 16: Solving for unknown time
Lessons In Electric Circuits, Volume 4, chapter 10: Multivibrators
Lessons in Electric Circuits, Volume 3, chapter 8, Positive Feedback
I don't know how I missed this one.