Franklin

MLA

Ausubel, David Paul, and Edmund V Sullivan. Theory and Problems of Child Development. 2d ed. New York: Grune & Stratton, 1970.

APA

Ausubel, D. Paul, & Sullivan, E. V. (1970). Theory and problems of child development. 2d ed. New York: Grune & Stratton.

Chicago

Ausubel, David Paul., and Edmund V Sullivan. Theory and Problems of Child Development. 2d ed. New York: Grune & Stratton, 1970.