Watzlawick, P. (1977). How real is real? Vintage Books.
Cita Chicago Style (17a ed.)Watzlawick, Paul. How Real Is Real? New York: Vintage Books, 1977.
Cita MLA (9a ed.)Watzlawick, Paul. How Real Is Real? Vintage Books, 1977.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.