Cita APA (7th ed.)

Keenan, T. (2002). An introduction to child development. SAGE Publications.

Cita Chicago (17th ed.)

Keenan, Thomas. An Introduction to Child Development. London ; Thousand Oaks, Calif.: SAGE Publications, 2002.

Cita MLA (8th ed.)

Keenan, Thomas. An Introduction to Child Development. SAGE Publications, 2002.