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Use WorldCat to search through resources available in libraries around the world. Then use Interlibrary Loan to request it.
Books address a more specific topic in greater detail than other types of information sources (journal articles or dictionary entries). They are oftentimes a great source to find additional information sources, which are often listed in footnotes or bibliographies. This is especailly true of textbooks.
The first book below offers a history of the Four Spiritual Laws on pages 98-103.