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Beattie, G.; Coughlan, J. (Feb 1999). "An experimental investigation of the role of iconic gestures in lexical access using the tip-of-the-tongue phenomenon". Br J Psychol. 90 (1). ss. 35-56. doi:10.1348/000712699161251. PMID10085545.
Maril, A.; Simons, JS.; Weaver, JJ.; Schacter, DL. (Feb 2005). "Graded recall success: an event-related fMRI comparison of tip of the tongue and feeling of knowing". Neuroimage. 24 (4). ss. 1130-8. doi:10.1016/j.neuroimage.2004.10.024. PMID15670690.