Also can be bought, but has a quite hefty price tag: https://www.amazon.com/Software-Defined-Radio-Engineers-Trav...
Other good resources are the books and courses on WirelessPi: https://wirelesspi.com/book/
To be clear, sdrforengineers site contain few useful links:
- link to printed version of this book on Amazon;
- link to video course "ECE4305 Software Defined Radio Systems and Analysis " as playlist on YouTube;
- link to their page on GitHub, where repo with LectureMaterials for this book hosted.
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