Henryk Krawczyk, author
TASK, 2017
Artikel Jurnal
Midgley, Mary, author
Routledge , 1995
Buku Teks
Al-Hawamdeh, Suliman, author
McGrawHill, 2002
Buku Teks
Bommel, Patrick van, author
Information Sceince Publishing, 2005
Buku Teks
edited by Alex Gray, Keith Jeffery, Jianhua Shao
Springer, 2008
Buku Teks