Seventeen Brief Lessons on Physics: Theoretical Physics for Researchers

For a complete journey into the field of Quantum Gravity we recommend Quantum Gravity in a Nutshell 1 by the same Author. Note: Most of the chapters in the previous books by the same author including this one have been re-written and new studies have been presented all in a new book Quantum Gravity in a Nutshell1. Therefore you should save your money for a better journey into a new adventure of quantum gravity from his first book "The tutors reference" to the second book " Mathematical Foundations of the Quantum Theory of Gravity" ... ... ... and Finally to Quantum Gravity in a Nutshell 1. https://www.amazon.com/dp/B07BYB9K79