Some of the documents included in the Sourcebook were reprinted in their entirety, others were excerpted. When text in a document was elided or deleted, we used ellipses to indicate where we deleted words other than internal footnotes or citations, and brackets to indicate any editing or additions. Other than adding editorial comments, we made the minimum number of changes needed in these documents to conform them to the book's style. Notes, tables, and figures were renumbered within the documents so that the reader would not be confused by any deletions. We have provided complete references for all materials.