How do you exclude refences by type from results?

Sorry to ask such a dumb question -- I'm sure it's in the documentation but I just can't find it -- I think I'm using the wrong terminology -

How do you exclude a type of reference from your search results? e.g., if I don't want web pages in my bibliography. Searching and putting in, "Type" "is not" doesn't seem to do the trick. (I'm thinking "type" in this context refers to a different field than what I want, which is reference type, e.g., newspaper article, thesis, etc. -- so, yes, I'm probably missing the *word* for what I mean by reference type? Or something? I'd rather not sort by type and then select accordingly).

Thanks for any help, fellow users!

-- Mary

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