Kingsbury, Damien, author
Oxford University Press, 2005
Buku Teks
Linebarger, Paul Myron Anthony, 1913-1966, author
York D van Nostrand, 1954
Buku Teks
edited by Howard J. Wiarda, Harvey F. Kline
Westview Press, 2007
Buku Teks
Oxford University Press, 2003
Buku Teks
Liddle, R. William, author
Allen and Unwin, 1996
Buku Teks