Cita APA (7th ed.)

Ridenour, N., & Johnson, I. (1949). Some special problems of children: Aged 2 to 5 years. The National Mental Health Foundation.

Cita Chicago (17th ed.)

Ridenour, Nina, i Isabel Johnson. Some Special Problems of Children: Aged 2 to 5 Years. Filadelfia: The National Mental Health Foundation, 1949.

Cita MLA (9th ed.)

Ridenour, Nina, i Isabel Johnson. Some Special Problems of Children: Aged 2 to 5 Years. The National Mental Health Foundation, 1949.