12.^Gallup, A.C. and Gallup, G.G. Jr (2007). "Yawning as a brain cooling mechanism: Nasal breathing and forehead cooling diminish the incidence of contagious yawning." (PDF). Evolutionary Psychology 5 (1). http://www.epjournal.net/filestore/ep0592101.pdfArchiválva2008. március 7-i dátummal a Wayback Machine-ben. Hozzáférés ideje: 2010-11-19.
4.^ a b Provine, R.R., Tate, B.C., and Geldmacher, L.L. (2005). "Yawning". American Scientist 93 (6), 532. doi:10.1511/2005.6.532. PMID 3120687. Archived from the original on June 4, 2008. Hozzáférés ideje: 210-11-19.
20.^ Schürmann et al.; Hesse, MD; Stephan, KE; Saarela, M; Zilles, K; Hari, R; Fink, GR (2005). "Yearning to yawn: the neural basis of contagious yawning.". NeuroImage 24 (4): 1260–1264. doi:10.1016/j.neuroimage.2004.10.022. PMID 15670705. (see also Platek et al.; Mohamed, FB; Gallup Jr, GG (2005). "Contagious Yawning and The Brain.". Cognitive Brain Research 23 (2-3): 448–52. doi:10.1016/j.cogbrainres.2004.11.011. PMID 15820652. )
^ Provine, R.R.; Tate, B.C. and Geldmacher, L.L. (2005). "Yawning". American Scientist 93 (6),532. doi:10.1511/2005.6.532. PMID 3120687. Archived from the original on June 4, 2008. Hozzáférés ideje: 2010-12-06.
^ Senju, A., Maeda, M., Kikuchi, Y., Hasegawa, T., Tojo, Y., and Osanai, H. (2). "Absence of contagious yawning in children with autism spectrum disorder". Biology Letters 3 (6), 706–708. doi:10.1098/rsbl.2007.0337. PMID 17698452.
^ Anderson, J.R., Myowa-Yamakoshi, M., and Matsuzawa, T. (2004). "Contagious yawning in chimpanzees". Proceedings of the Royal Society of London B: Biological Sciences 271: S468–S470. doi:10.1098/rsbl.2004.0224. PMID 15801606
^ Paukner, A., and Anderson, J.R. (2006). "Video-induced yawning in stumptail macaques (Macaca arctoides)". Biology Letters 2 (1), 36–38. doi:10.1098/rsbl.2005.0411. PMID 17148320
4.^ a b Provine, R.R., Tate, B.C., and Geldmacher, L.L. (2005). "Yawning". American Scientist 93 (6), 532. doi:10.1511/2005.6.532. PMID 3120687. Archived from the original on June 4, 2008. Hozzáférés ideje: 210-11-19.
12.^Gallup, A.C. and Gallup, G.G. Jr (2007). "Yawning as a brain cooling mechanism: Nasal breathing and forehead cooling diminish the incidence of contagious yawning." (PDF). Evolutionary Psychology 5 (1). http://www.epjournal.net/filestore/ep0592101.pdfArchiválva2008. március 7-i dátummal a Wayback Machine-ben. Hozzáférés ideje: 2010-11-19.
^ Provine, R.R.; Tate, B.C. and Geldmacher, L.L. (2005). "Yawning". American Scientist 93 (6),532. doi:10.1511/2005.6.532. PMID 3120687. Archived from the original on June 4, 2008. Hozzáférés ideje: 2010-12-06.
