Gardner, H., Feldman, D. H., & Krechevsky, M. (1998). Project zero frameworks for early childhood education. Teachers College Press.
Lua i Stíl Chicago (17ú heag.)Gardner, Howard, David Henry Feldman, agus Mara Krechevsky. Project Zero Frameworks for Early Childhood Education. New York: Teachers College Press, 1998.
Lua MLA (9ú heag.)Gardner, Howard, et al. Project Zero Frameworks for Early Childhood Education. Teachers College Press, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.