Engeström, Y. (1987). Learning by expanding: An activity-theoretical approach to developmental research. Orienta-Konsultit Oy.
Chicago Style (17th ed.) CitationEngeström, Yrjö. Learning by Expanding: An Activity-theoretical Approach to Developmental Research. Helsinki: Orienta-Konsultit Oy, 1987.
MLA (9th ed.) CitationEngeström, Yrjö. Learning by Expanding: An Activity-theoretical Approach to Developmental Research. Orienta-Konsultit Oy, 1987.
Warning: These citations may not always be 100% accurate.