Howard, John R., author
J.B. Lippincott, 1974
Buku Teks
Woll, Peter, author
Little, Brown , 1986
Buku Teks
Hall, John Oliver, author
American Book Company, 1958
Buku Teks
Weyl, Walter E.
N.Y. Harper & Row , 1964
Buku Teks
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Harper & Brothers, 1957
Buku Teks