Gabriel, Peter P.
Harvard University, Division of Research, Graduate School of Business Administration, 1967
Buku Teks
edited by Nick Eberstadt
Frederick A. Praeger, 1981
Buku Teks
Kirkpatrick, Colin H.
George Allen and Unwin, 1984
Buku Teks
Johnson, Harry G., editor
Praeger , 1968
Buku Teks
Heller, Jack
Law School of Harvard University, 1963
Buku Teks SO