Collaboration scripts for mastership skills: online game about classroom dilemmas in teacher education. - Hummel, Hans G. K.; Geerts, Walter; Slootmaker, Aad; Kuipers, Derek; Westera, Wim (Interact. Learn. Environ., 2015)

Structuring Collaboration Scripts - Optimizing Online Group Work on Classroom Dilemmas in Teacher Education. - Hummel, Hans G. K.; Geerts, Walter; Slootmaker, Aad; Kuipers, Derek; Westera, Wim (2014)

Structuring Collaboration Scripts: Optimizing Online Group Work on Classroom Dilemmas in Teacher Education. - Hummel, Hans G. K.; Geerts, Walter; Slootmaker, Aad; Kuipers, Derek; Westera, Wim (2014)

CALL, Culture and the Language Curriculum (Springer, 1998)

Are User Models Necessary in Hypermedia Design? - Calvi, Licia; Geerts, Walter (1995)