What is a good book to read about 3D printer settings?
There may be books out there, but purchasing a book isn't in your best interest. The reason so much of the information seems to be from amateurs is because every 3d printer is different. 

To find the correct settings for your printer you need to calibrate it based on the material, slicer software, hardware, and firmware. Your best option to find a good starting point is to check the manufacturer's website and look for a forum. 

Even using the same printer and material as someone else has the potential to yield different results.