Knickerbocker, Frederick T.
Division of Research, Graduate School of Business Administration, Harvard University, 1973
Buku Teks
Dunning, John H.
George Allen and Unwin , 1974
Buku Teks
Vernon, Raymond
Harvard University Press, 1972
Buku Teks
Artikel Jurnal
edited by D.W. Pearce with the assistance of J. Rose
Macmillan, 1975
Buku Teks