TY - BOOK AU - ed. by David H. Jonassen and Heinz Mandl. AU - Mandl, Heinz., ed ED - Jonassen, David H., ed TI - Designing hypermedia for learning T2 - NATO ASI Series, Series F SN - 3540529586 U1 - 005.75 PY - 1990/// CY - Berlin PB - Springer-Verlag ER -