Cita APA (7a ed.)

Mreła, K., & Kostecki, M. J. (1981). Barriers and perspectives. The Polish Academy of Sciences. Institute of Philosophy and Sociology.

Cita Chicago Style (17a ed.)

Mreła, Krzysztof, y Marian J. Kostecki. Barriers and Perspectives. Warszawa: The Polish Academy of Sciences. Institute of Philosophy and Sociology, 1981.

Cita MLA (9a ed.)

Mreła, Krzysztof, y Marian J. Kostecki. Barriers and Perspectives. The Polish Academy of Sciences. Institute of Philosophy and Sociology, 1981.