@inproceedings{HCI-CE-1987-Owen,
	author        = "David Owen",
	booktitle     = "{Proceedings of the Second International Conference on Human-Computer Interaction. Volume 2: Cognitive Engineering in the Design of Human-Computer Interaction and Expert Systems}",
	isbn          = "0-444-42848-8",
	pages         = "349--356",
	publisher     = "{Elsevier}",
	title         = "{Direct Manipulation and Procedural Reasoning}",
	year          = 1987,
}