http：//www.trumanlibrary.org/whistlestop/study_collections/doctrine/large/documents/index.php?documentdate=1947-03-12；documentid=5-9；pagenumber=1；http：//avalon.law.yale.edu/20th_century/trudoc.asp. bx9aAvCYR2VC8yA07Df03kOC6nLrSzmMuH5ZpwjDOcTc8D++1GdT81OSbxW90srw
