Gardner, Burleigh B., author
Irwin , 1955
Buku Teks
Reis, Matthew, author
[American Management Association;, ], 2010
eBooks
Tregold, R.F., author
International University Press, 1950
Buku Teks
edited by John W. Jones, Brian D. Steffy, Douglas W. Bray
Lexington Books, 1991
Buku Referensi
edited by Robert Teviot Livingston and Stanley H. Milberg
Columbia University Pres, 1957
Buku Teks