A Logical approach to expert systems and natural language processing: knowledge systems and prolog
edited by Adrian Walker
Addison-Wesley, 1987
 Buku Teks SO
Wright, Georg Hendrik von
Logical studies
Routledge, 1957
 Buku Teks SO
Carnap, Rudolf
The Logical syntax of language
Littlefield, Adams , 1959
 Buku Teks SO
Krulee, Gilbert K.
Computer processing of natural language
Prentice-Hall, 1991
 Buku Teks SO
Handbook of natural language processing
edited by Nitin Indurkhya; Fred J. Damerau
CRC Press, 2010
 Buku Teks SO