Propeller blade angle of attack versus pitch
U.S. Dept. of Transportation, FAA, Flight Standards Service
Pilot's Handbook of Aeronautical Knowledge, FAA-H-8083-25B, <a rel="nofollow" class="external free" href="https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/media/07_phak_ch5.pdf">https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/media/07_phak_ch5.pdf</a>