Anderson, Edward G., author
Springer, 2012
eBooks
Agus Pakpahan
BRI, 2004
Buku Teks
Avanti Fontana, author
2006
Artikel Jurnal
edited by Zacharoula Andreopoulou, Vagis Samathrakis, Soulla Louca, Maro Vlacopoulu
Igi Global, 2014
Buku Teks
West, Alan, author
Prentice-Hall, 1992
Buku Teks