Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.