Relethford, John., author
The human species : an introduction to biological anthropology
McGraw-Hill Humanities, 2013
 Buku Teks
Bloom, Lois
Language development and language disordes
New York John Wiley & Sons 1978
 Buku Teks
Cook, Guy (Guy W. D.), author
Language play, language learning
Oxford University Press, 2000
 Buku Teks
Language and Language Behavior Abstract's
San Diego : Sosiological Abstracts Inc.
 Majalah, Jurnal, Buletin
Language and language learning
edited by Albert H. Marckwardt
National Council of Teachers of English, 1968
 Buku Teks
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