Akach, Philemon A.O Deafness : A guide for parents, teachers and community workers / Philemon A.O. Akach; Edited by Doreen Woodford. - Paris : UNESCO, 2000. - 32 p. - ED-2000/WS/33 . No. de Clasificación Universal Decimal: 376.33 (100) =20 "2000" AKA.