Lynn, Robert Athan, 1930-, author
McGraw-Hill, 1980
Buku Teks
Bish, Robert L., author
Prentice-Hall, 1974
Buku Teks
Stonier, Alfred W.
Longman Group Limited, 1980
Buku Teks
Mussey, Henry R.
Ginn and Company, 1947
Buku Teks
Boulding, Kenneth E. (Kenneth Ewart), 1910-1993, author
Harper & Row, 1966
Buku Teks