Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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