Easton, F. (1997). "Educating the whole child, "head, heart, and hands": Learning from the Waldorf experience". Theory into Practice. 36 (2): 87–94. doi:10.1080/00405849709543751.
Salinsky, Tom (2017). The improv handbook : the ultimate guide to improvising in comedy, theatre, and beyond. Frances-White, Deborah,, McShane, Michael (Second ed.). London: Bloomsbury Publishing. p. 5.10. ISBN9781350026162. OCLC973481500.