Traffic Patterns
This page covers Task B. Traffic Patterns from the FAA-S-ACS-6C Private Pilot Airman Certification Standards.
Airport Operations
From FAA-H-8083-3C Airplane Flying Handbook page 5-20:
At the relatively low altitude of a base-to-final approach turn, a pilot should be reluctant to use bank angles greater than 30 degrees and should not make a skidding turn if correcting for any overshoot.