Cunningham, William P., author
WCB/McGraw-Hill, 1999
Buku Referensi
Cunningham, William P., author
McGraw-Hill, 2005
Buku Teks
McCaffrey, Stephen C., author
Thomson/West, 2009
Buku Teks
Bill Freedman, editor
Springer Reference, 2014
Buku Teks
Artikel Jurnal