Fairchild, Fred Rogers, author
Macmillan, 1947
Buku Teks
Lipsey, Richard G., 1928-, author
Harper & Row, 1981
Buku Teks
Lipsey, Richard G., 1928-, author
Harper & Row, 1978
Buku Teks
Lipsey, Richard G., 1928-, author
Harper & Row, 1966
Buku Teks
Kohler, Heinz, author
Healt and Company, 1992
Buku Teks