Clark, H.1970: Word associations and linguistic theory. In Lyons, J. editor, New horizons in linguistics . Harmondsworth: Pelican.
2.
Faerch, C., Haastrup, K. and Philipson, R.1984: Learner language and language learning. Clevedon: Multilingual Matters.
3.
Melka Teichroew, F.J.1982: Receptive vs. productive vocabulary: a survey. Interlanguage Studies Bulletin: Utrecht, 6,2: 5-33.
4.
— 1989: Les notions de reception et de production dans le domaine lexical et semantiqueBern: Peter Lang.
5.
Palmberg, R.1987: Patterns of vocabulary development in foreign language learners. Studies in Second Language Acquisition, 9: 201-20.
6.
Treville, M.C.1988. Faut-il enseigner le vocabulaire de la langue seconde ? In LeBlanc, R., Compain, R., Duquette, L. and Seguin, H., editors, L'enseignement des langues secondes aux adultes: recherches et pratiques. Ottawa: Presse de l'Universite d'Ottawa.
7.
van Lancker, D.1987. Nonpropositional speech: neurolinguistic studies. In Ellis, A., editor, Progress in the Psychology of Language. Vol III. Hillsdale, NJ.: Lawrence Erlbaum Ass.
8.
Wilson, R. and Beineke, L.1979. Applications of graph theory. New York : Academic Press.