Gardner, H., Feldman, D. H., & Krechevsky, M. (1998). Project zero frameworks for early childhood education. Teachers College Press.
Chicago-referens (17:e uppl.)Gardner, Howard, David Henry Feldman, och Mara Krechevsky. Project Zero Frameworks for Early Childhood Education. New York: Teachers College Press, 1998.
MLA-referens (9:e uppl.)Gardner, Howard, et al. Project Zero Frameworks for Early Childhood Education. Teachers College Press, 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.