Douglas-Young, John, author
Parker Publishing Company, 1979
Buku Referensi
Handy, Richard, author
[Springer, ], 2012
eBooks
Bilenky, S.M., author
Pergamon Press, 1974
Buku Teks
edited by David Rubel
H. Holt, 1998
Buku Teks
Koningsveld, R., author
Oxrord University Press, 2008
Buku Teks