Birkhauser Verlag, 1972
Buku Teks
edited by Lawrence E. Harrison, Samuel P. Huntington
Basic Books, 2000
Buku Teks
Eisman, Louis, author
Prentice-Hall, 1964
Buku Teks
Knapp, Brian, author
Longman House, 1992
Buku Teks
Knapp, Brian J., author
Longman, 1992
Buku Teks