The first source should be the Q9000-2000 (if you are transitioning or certifying to the ISO 9001:2000 standard) which is the normative reference for the standard. This does not define policies per se only Quality Policy, but does provide a definition for procedure:

3.4.5 Procedure: specified way to carry out an activity or a process. Note 1: Procedures can be documented or not. Note 2: When a procedure is documented, the term "written procedure" or "documented procedure" is frequently used. The document that contains a procedure can be called a "procedure document".

For Quality Policy:
3.2.4 Quality Policy - overall intentions and direction of an organization related to quality as formally expressed by top management. Note 1: Generally the quality policy is consistent with the overall policy of the organization and provides a framework for the setting of quality objectives. Note 2: Quality management priciples presented in this International Standard can form a basis for the establishment of a quality policy.

However, I've also gone to Wordsmyth (http://www.wordsmyth.net/) and provide the definitions listed:

Policy: a set of principles that is used as a guide for action, esp. in a government or business.

Procedures: a series of actions necessary for accomplishing a particular goal; course of action.

I hope this helps!

PS: Marc has many links, which is where I found Wordsmyth, on his links page - Cayman Links Page (http://Elsmar.com/info.html)