Institute I C S.  1997.  https://framenet.icsi.berkeley.edu/fndrupal/.

• Google Scholar

Trappes-Lomax H.  1997.  Oxford learner's wordfinder dictionary.

• Google Scholar

Summers D.  1993.  Longman language activator: the world's first production dictionary.

• Google Scholar

Roget P.  1989.  Top Pocket Roget's Thesaurus of English Words and Phrases. Longman Top Pocket Series. :640.

• Google Scholar