Finch, Frank, author
Fac On File Publications, 1985
Buku Referensi
Unesco, 1979
Buku Teks
Wanlass, Richard L., author
[Springer, ], 2012
eBooks
Vickman, Thomas M., author
Prentice-Hall, 1995
Buku Referensi
Forsyth, Frederick, 1938-, author
Bantam Books, 1995
Buku Teks