Wettlaufer, M. (1968). Children's world: Holt's early childhood program : teacher's guide. Holt, Rinehart and Winston.
Chicago-referens (17:e uppl.)Wettlaufer, Margaret. Children's World: Holt's Early Childhood Program : Teacher's Guide. New York: Holt, Rinehart and Winston, 1968.
MLA-referens (8:e uppl.)Wettlaufer, Margaret. Children's World: Holt's Early Childhood Program : Teacher's Guide. Holt, Rinehart and Winston, 1968.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.