APA (7. basım) Alıntı

Penn, H. (2000). Early childhood services: Theory, policy, and practice. Open University Press.

Chicago Style (17. basım) Atıf

Penn, Helen. Early Childhood Services: Theory, Policy, and Practice. Buckingham, [Eng.]: Open University Press, 2000.

MLA (9th ed.) Atıf

Penn, Helen. Early Childhood Services: Theory, Policy, and Practice. Open University Press, 2000.