Wettlaufer, M. (1968). Children's world: Holt's early childhood program : teacher's guide. Holt, Rinehart and Winston.
Lua i Stíl Chicago (17ú heag.)Wettlaufer, Margaret. Children's World: Holt's Early Childhood Program : Teacher's Guide. New York: Holt, Rinehart and Winston, 1968.
Lua MLA (8ú heag.)Wettlaufer, Margaret. Children's World: Holt's Early Childhood Program : Teacher's Guide. Holt, Rinehart and Winston, 1968.
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