Israel, Saul, author
Holt, Rinehart and Winston, 1976
Buku Teks
Haggett, Peter, author
Harper & Row, 1975
Buku Teks
James, Preston E., author
Macmillan, 1972
Buku Teks
Platt, Rutherford H., author
Island Press, 2014
Buku Teks
Walmsley, D.J., author
Longman, 1993
Buku Teks