Frost, J. L., & Klein, B. L. (1979). Children's play and playgrounds. Allyn and Bacon.
Chicago Style (17th ed.) CitationFrost, Joe L., and Barry L. Klein. Children's Play and Playgrounds. Boston: Allyn and Bacon, 1979.
ציטוט MLAFrost, Joe L., and Barry L. Klein. Children's Play and Playgrounds. Allyn and Bacon, 1979.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.