Cuyler, M., & Hillenbrand, W. (2006). Please play safe!: Penguin's guide to playground safety. Scholastic Press.
Lua i Stíl Chicago (17ú heag.)Cuyler, Margery, agus Will Hillenbrand. Please Play Safe!: Penguin's Guide to Playground Safety. New York: Scholastic Press, 2006.
Lua MLA (9ú heag.)Cuyler, Margery, agus Will Hillenbrand. Please Play Safe!: Penguin's Guide to Playground Safety. Scholastic Press, 2006.
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