edited by Robert O. Freedman
Westview Press, 1984
Buku Teks
Walz, Jay
Atheneum, 1966
Buku Teks
Walker, Allan S.
Australian War Memorial, 1956
Buku Teks
Palmer, Monte
Thomson Wadsworth, 2007
Buku Teks
MEI Publications Ltd, 2008
Majalah, Jurnal, Buletin