APA (7th ed.) Zitazioa

Sauvy, J., & Sauvy, S. (1974). The child's discovery of space. Penguin Educaction.

Chicago Style (17th ed.) Zitazioa

Sauvy, Jean, eta Simonne Sauvy. The Child's Discovery of Space. Harmondsworth, Eng.: Penguin Educaction, 1974.

MLA (9th ed.) Zitazioa

Sauvy, Jean, eta Simonne Sauvy. The Child's Discovery of Space. Penguin Educaction, 1974.