Vernon, Raymond, author
Basic Books, 1971
Buku Teks
Behrman, Jack N., author
Prentice-Hall, 1970
Buku Teks
Yoshino, Michael Y., author
Harvard University Press, 1980
Buku Teks
Behrman, Jack N., author
McGraw-Hill, 1971
Buku Teks
LaPalombara, Joseph, author
Conference Board, 1977
Buku Teks