Hanson, A.H.
London Routledge & Kegan Paul 1959,
Buku Teks
Yoshitake, Kiyohiko
Sage Publications, 1973
Buku Teks
Hansen, A. H.
Routledge , 1965
Buku Teks
Weiner, Myron, author
The University of Chicago Press , 1962
Buku Teks
Chandler, Alfred D. Jr.
Cambridge, Mass. Massachusetts Institute of Technology Press 973,
Buku Teks