Friedrich, Carl J., author
Rinehart, 1959
Buku Teks
Morrison, John, author
Penguin Books, 1985
Buku Teks
Galbraith, John Kenneth, 1908-2006, author
Harvard University Press, 1955
Buku Teks
Gruber, Ruth, author
Hill and Wang, 1960
Buku Teks
Gruber, Ruth, author
Hill and Wang, 1960
Buku Teks