Landauer, Carl, author
J. B. Lippincott, 1964
Buku Teks
Mansfield, Edwin, author
W.W. Norton, 1974
Buku Teks
Nevin, Edward
Macmillan ; St. Martin's Press, 1960
Buku Klasik
Reitaku International Journal of Economic Studies,
Majalah, Jurnal, Buletin
Bower, Joseph L., author
Harvard Business School Press, 1972
Buku Teks