APA

Piaget J., . (1951). The child's conception of physical causality. New York: Humanities Press.

Chicago

Piaget Jean, . 1951. The child's conception of physical causality. New York: Humanities Press.

Harvard

Piaget J., . (1951). The child's conception of physical causality. New York: Humanities Press.

MLA

Piaget Jean, . The child's conception of physical causality. New York: Humanities Press. 1951.