Some Prerequisites for Electronic Commerce. - Michael S. H. Heng; Marcel Creemers; Tibert Verhagen (PACIS, 2000)

Predicting Online Purchase Behavior: Replications and Test of Competing Models. - Hans van der Heijden; Tibert Verhagen; Marcel Creemers (HICSS, 2001)

Understanding online purchase intentions: contributions from technology and trust perspectives. - Hans van der Heijden; Tibert Verhagen; Marcel Creemers (Eur. J. Inf. Syst., 2003)