United Nations Educational, Scientific and Cultural Organization. (1969). Special education. s.n.
Cita Chicago (17th ed.)United Nations Educational, Scientific and Cultural Organization. Special Education. [Paris: s.n, 1969.
Cita MLA (9th ed.)United Nations Educational, Scientific and Cultural Organization. Special Education. s.n, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.