Frost, J. L. (1985). When children play: Proceedings of the International Conference on Play and Play Environments. Association for Childhood Educational International.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Frost, Joe L. When Children Play: Proceedings of the International Conference on Play and Play Environments. Wheaton, Md: Association for Childhood Educational International, 1985.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Frost, Joe L. When Children Play: Proceedings of the International Conference on Play and Play Environments. Association for Childhood Educational International, 1985.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.