Kovačević, T. R. (2005). Osnovna škola za decu oštećenog sluha i govora: "Radivoj Popović", Zemun. Beogradska defektološka škola, No. 1, pp. 1-21.Lexical availability of deaf and hard of hearing elementary school children. Abstract: The influence of environmental factors on size(wealth and variety)of child vocabulary, and on lexical availability of words is great and significant. Active vocabulary of deaf and hard of hearing show constant growth trend. There are great individual differences in the size of active and passive vocabulary among individual vocabularies, on all age-levels of elementary school age. Hearing impaired children adapt categorical structure of their mother language are developed with age. Acquiring of knowledge in school is one of important factors which affect development and wealth of active and passive vocabulary of deaf and hard of hearing children.

Vujasinović, Z. L. & Dimić, N. D. (2000). Some vocabulary of specifics deaf and hard of hearing preschool children. Beogradska defektološka škola, 2000, No. 2-3, pp. 5-13.Abstract: This paper presents the research results of deaf and hard of hearing children vocabulary norms - preschool age. The research was done with 60 preschool age children - deaf and hard of hearing children and group of hearing children. On the basis of the research results, it can be concluded that there is a significant difference in consideration of structure in lexicon between the hearing impaired and the children with normal sense of hearing.

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