Jagieła, Jarosław. “Book Review: Helena Hargaden and Charlotte Sills (2010). Transactional Analysis: A Relational Perspective. London and New York Routledge: Taylor & Francis Group”. Edukacyjna Analiza Transakcyjna, no. 15, Sept. 2026, p. eat-2026-rec-01, https://doi.org/10.16926/eat.2026.15.06.en.