Kooij, R. v. d., & Groot, R. d. (1977). That's all in the game: Theory and research, practice and future of children's play. Schindele.
Chicago-Zitierstil (17. Ausg.)Kooij, Rimmert van der, und Roel de Groot. That's All in the Game: Theory and Research, Practice and Future of Children's Play. Rheinstetten: Schindele, 1977.
MLA-Zitierstil (9. Ausg.)Kooij, Rimmert van der, und Roel de Groot. That's All in the Game: Theory and Research, Practice and Future of Children's Play. Schindele, 1977.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.