How to validation of autoclave as per different types of autoclave
HTM 2010
EN285
ISO 17665
PDA 61
You can also look for PDA technical report #1, which is for moist heat sterilization; and goes into great detail about the subject.
PDA Technical Report No. 1, Revised 2007, (TR 1) Validation of Moist Heat Sterilization Processes Cycle Design, Development, Qualification and Ongoing Control