Bouman, P. J. (Pieter Jan)
McGraw-Hill , 1954
Buku Teks
Black, Jeremy, author
Cambridge University Press, 1996
Buku Referensi
Grasso, June, author
M.E. Sharpe, 2004
Buku Teks
Murdoch, James, author
Routledge , 1926
Buku Referensi
Kohn, Hans, author
D. Van Nostrand Company, Inc., 1963
Buku Teks