The Indonesian Update
Jakarta: The Indonesian Institute,
 Majalah, Jurnal, Buletin
UI update
Kantor komunikasi UI,
 Majalah, Jurnal, Buletin
Global justice update
Institute for Global Justice,
 Majalah, Jurnal, Buletin
Wilf, Herbert S.
Combinatorial algorithms: an update
Society for Industrial and Applied Mathematics, 1989
 eBooks
Search engine update
 Artikel Jurnal