Todaro, Michael P., author
Longmann, 1978
Buku Teks
Kiekhofer, William H., author
D. Appleton Century, 1946
Buku Teks
Todaro, Michael P., author
Longman, 1992
Buku Teks
Gill, Stephen, author
John Hopkins University Press, 1988
Buku Teks
Galbraith, John Kenneth, 1908-2006, author
Harvard University Press, 1962
Buku Teks