Kitchin, C.R., author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Davies, Paul
Simon & Scuster , 1995
Buku Teks
edited by Manfred P. Leubner, Zoltán Vörös
Springer, 2012
eBooks
Ellwanger, Ulrich, author
[Springer, ], 2012
eBooks
Smart, W.M.
Cambridge University, 1962
Buku Teks