Internal Audit principles

Hi all, I am italian and 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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Depending on the company and the regulatory agency all of the audit standards should be followed however, (3) the Institute of Internal Auditors" has guidelines for specific industries
http://en.wikipedia.org/wiki/Generally_accepted_auditing_standards
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