Clarkson, P. (1999). Gestalt counselling in action (2nd ed.). Sage.
Chicago Style aipamenaClarkson, Petruska. Gestalt Counselling in Action. 2nd ed. London: Sage, 1999.
MLA aipamenaClarkson, Petruska. Gestalt Counselling in Action. 2nd ed. Sage, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.