Birch, D., & Worley, P. (2014). Provocations: Philosophy for secondary school. Crown House Publishing Limited.
Chicago-viite (17. p.)Birch, David, ja Peter Worley. Provocations: Philosophy for Secondary School. Bancyfelin, Camarthen, Wales, [England]: Crown House Publishing Limited, 2014.
MLA-viite (9. p.)Birch, David, ja Peter Worley. Provocations: Philosophy for Secondary School. Crown House Publishing Limited, 2014.
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