Piaget, Jean, 1896-1980
Language and thought of the child
Meridian Book , New York Meridian Book 1960
 Buku Teks SO
Anderson, Wallace L.
Introductory readings on language
Holt, Rinehart and Winston, 1966
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Collie, Joanne
Literature in the language classroom: a resource book of ideas and activities
Cambridge University Press, 1990
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Collie, Joanne
Literature in the language classroom: a resource book of ideas and activities
Cambridge University Press, 1987
 Buku Teks SO
Penanda kesantunan berbahasa pada bahasa Kaili ; marker of politenes on Kaili language
 Artikel Jurnal