Workshop 2: DDI 101: Codebook Creation for Beginners. - William (IASSIST Conference, 2004)

Information Visualization for Tourist and Travelling in Indonesia. - Adityo Ashari Wirjono; Z. S. Ricky Lincoln; William; Dewi Agushinta R. (ACC (2), 2011)

Development of Affordable and Powerful Swarm Mobile Robot Based on Smartphone Android and IOIO board. - Alexander Agung Santoso Gunawan; William; Boby Hartanto; Aditya Mili; Widodo Budiharto; Afan Galih Salman; Natalia Chandra (ICCSCI, 2017)

Resepfinder as an iOS-Based Local Cooking Recommendation. - William; Hanry Ham (ICCSCI, 2019)