THE 20TH CENTURY A RETORSPECTIVE
CHOI CHATTERJEE JEFFREY L.GOULD PHYLLIS M.MARTIN等著2222 年出版422 页ISBN:9780813326915
THE NEW HUTCHINSON 20TH CENTURY ENCYCLOPEDIA
1977 年出版1334 页ISBN:009120030X;0091403006
AMERICAN LAW IN THE 20TH CENTURY
LAWRENCE M.FRIEDMAN2222 年出版722 页ISBN:0300091370
UNEXPLAINED MYSTERIES OF THE 20TH CENTURY
JANET AND COLIN BORD1989 年出版432 页ISBN: