Scott, Andrew M.
Holt, Rinehart & Winston, 1959
Buku Teks
edited by Howard J. Wiarda, Harvey F. Kline
Westview Press, 2007
Buku Teks
Busey, James L.
Random House, 1968
Buku Teks
Wiarda, Howard J.
Wardword, 1995
Buku Teks
Martens, Stephanie B.
Palgrave Macmillan, 2016
Buku Teks