Frost, J. L. (1985). When children play: Proceedings of the International Conference on Play and Play Environments. Association for Childhood Educational International.
Citazione stile Chigago Style (17a edizione)Frost, Joe L. When Children Play: Proceedings of the International Conference on Play and Play Environments. Wheaton, Md: Association for Childhood Educational International, 1985.
Citatione MLA (9a ed.)Frost, Joe L. When Children Play: Proceedings of the International Conference on Play and Play Environments. Association for Childhood Educational International, 1985.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.