1Hulstijin,J. H. 1993. "When do foreign language readers look up the meaning of unfamiliar words? The Influence of task and learner variables". Modern Language Jouranl 77.
2Knight, S. 1994. "Dictionary use while reading: the effects on comprehension and vocabulary acquisition for students of different verbal abilities". Modern Language Journal 78.
3Nag'y, W. E. 1988. Teaching, Vocabulary to Improve Reading Comprehension. Newark, DE: International Reading Association.
4Nattinger, J. 1988. "Some current trends in vocabulary teaching". In R. Carter & M. McCarthy (eds). Vocabulary and Language Teaching . London: Longman .
