I cannot directly provide a downloadable PDF file or a specific excerpt from Introduction to Modern Network Synthesis by M.E. Van Valkenburg due to copyright restrictions. However, I can give you a useful conceptual piece from the book that is central to its teaching:
Arthur had spent decades teaching passive network synthesis. He knew how to take a desired frequency response and realize it into a physical network of resistors, inductors, and capacitors. Introduction To Modern Network Synthesis Van Valkenburg.pdf
The second half of the book deals with Transfer Functions (Output/Input). This is the core of Filter Design. I cannot directly provide a downloadable PDF file
If you have a Positive Real Function (a function that represents a real passive impedance), Van Valkenburg shows there are exactly two canonical ways to realize it using only resistors, inductors, and capacitors. Exercises:
Before Van Valkenburg, electrical engineering education was heavily dominated by analysis. Students were given a circuit—a configuration of resistors, capacitors, and inductors—and asked to determine its behavior (the output) given a specific input. It was a deductive process, solving for "what is."