Westview Press, 1982
Buku Teks
John Wiley & Sons, 1946
Buku Teks
Spong, Mark W.
John Wiley & Sons, 1989
Buku Teks
Dupuy, Jean-Pierre, 1941-, author
Stanford university press, 2013
Buku Teks
Greene, Mark R.
South-Western Publishing CO., 1983
Buku Teks