Sievers, Allen M., author
The Johns Hopkins University Press, 1974
Buku Teks
Todaro, Michael P., author
Longman, 1992
Buku Teks
Todaro, Michael P., author
Longman, 1989
Buku Teks
Fryer, D.W., author
McGraw-Hill, 1965
Buku Teks
Kahn, Herman, author
Morrow Quill Paperbacks, 1979
Buku Teks