Piaget, J., Tomlinson, A., & Tomlinson, J. (1960). The child's conception of the world. Littlefield.
Lua i Stíl Chicago (17ú heag.)Piaget, Jean, Andrew Tomlinson, agus Joan Tomlinson. The Child's Conception of the World. Paterson, N. J: Littlefield, 1960.
Lua MLA (9ú heag.)Piaget, Jean, et al. The Child's Conception of the World. Littlefield, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.