Search the Library Catalog
NOTE: In general, books about careers are not found in any one section of the library.
It is best to keyword search your career and add the words "vocational guidance," such as
Nursing Vocational Guidance
Most careers have a subject such as... Massage therapy -- Vocational guidance
Tips for seaching the catalog:
Google Book Search works just like web search. If the book is out of copyright, or the publisher has given Google permission, you'll be able to see a preview of the book, and in some cases read the entire text. If it's in the public domain, you're free to download a PDF copy. If the full-text is not available, try searching for it in the library catalog or requesting it through Inter-library loan.
Maybe your not finding what you want to find and do not believe it even exists! Try searching WorldCat. You may find that you cannot get the book, but at least you will know it exists somewhere.