Help on audit principles

Hi all, once again on this matter: I wold like to know which are the differences and the meanings of the following 3 auditing rules:
1) Auditing Standards - edited by AICPA
2) Internationa Standard on Audit - edited by IFAC 3) Practice Advisories and related Standards - edited by The IIA
In other words: which is the first, second and third to be followed; what are the differences between the 3 general sets of standards, etc....
Thanks in advance
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