APA (7th ed.) Citation

Wertsch, J. V. (1990). The concept of activity in Soviet psychology. University Microfilms International.

Chicago Style (17th ed.) Citation

Wertsch, James V. The Concept of Activity in Soviet Psychology. Ann Arbor: University Microfilms International, 1990.

MLA (9th ed.) Citation

Wertsch, James V. The Concept of Activity in Soviet Psychology. University Microfilms International, 1990.