V. V. Davydov

Perspectives on activity theory: The content and unsolved problems of activity theory

V. V. Davydov, 1999 .

The Problem of Activity in the Works of A. N. Leont'ev

N. F. Talyzina, V. Zinchenko, V. V. Davydov, 1983 .

A Concept of Educational Activity for Schoolchildren

V. V. Davydov, A. K. Markova, 1982 .

Perspectives on activity theory: The content and unsolved problems of activity theory

V. V. Davydov, 1999 .