Marion, M. (1999). Guidance of young children (5th ed.). Prentice-Hall.
Cita Chicago (17th ed.)Marion, Marian. Guidance of Young Children. 5th ed. Upper Saddle River, N.J: Prentice-Hall, 1999.
Cita MLA (9th ed.)Marion, Marian. Guidance of Young Children. 5th ed. Prentice-Hall, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.