Clarkson, Petrūska, 1947-2006 (Personal Name)

Her Transactional analysis psychotherapy, 1991: CIP t.p. (Petrūska Clarkson) data sheet (b. 10/31/47) pub. info (Dr.; certified teaching member of the Int. Transactional Analysis Assn.)

Gestalt counselling in action, 2014: t.p. (Petrūska Clarkson) p. vii ( passed away in 2006)