Subject Headings are specialized terms used in cataloging to identify particular topics or ideas.
Always check publishers and read carefully! For a topic like "happiness," many of the results will be self-help books, not academic publishers focusing on a study of the subject. Pro-tip: Check if the publisher is a university press (i.e. Columbia University Press), which requires more rigorous research. A book titled "How to find happiness" will likely not suit your academic needs - unless your professor requires you to analyze self-help books!
Contact the Librarian for Jewish Studies:
309 Lehman Library