Childe, Vere Gordon; Clarke, D. V. (1931). Skara Brae. UK: H.M.S.O., previously: Kegan Paul, Trench, Trubner & Company, Limited. pp. 12, 20, 28. ISBN0-11-491755-8 – via Google Books.
Best, E.L.; Sandoe, J.a.T.; Wilcox, M.H. (1 January 2012). "Potential for aerosolization of Clostridium difficile after flushing toilets: the role of toilet lids in reducing environmental contamination risk". The Journal of Hospital Infection. 80 (1): 1–5. doi:10.1016/j.jhin.2011.08.010. ISSN1532-2939. PMID22137761.
Best, E.L.; Sandoe, J.a.T.; Wilcox, M.H. (1 January 2012). "Potential for aerosolization of Clostridium difficile after flushing toilets: the role of toilet lids in reducing environmental contamination risk". The Journal of Hospital Infection. 80 (1): 1–5. doi:10.1016/j.jhin.2011.08.010. ISSN1532-2939. PMID22137761.
Widdowson, Marc-Alain; Glass, Roger; Monroe, Steve; Beard, R. Suzanne; Bateman, John W.; Lurie, Perrianne; Johnson, Caroline (20 April 2005). "Probable transmission of norovirus on an airplane". JAMA. 293 (15): 1859–60. doi:10.1001/jama.293.15.1859. ISSN1538-3598. PMID15840859.
Ho, Mei-Shang; Monroe, Stephan S.; Stine, Sarah; Cubitt, David; Glass, Roger I.; Madore, H. Paul; Pinsky, Paul F.; Ashley, Charles; Caul, E.O. (21 October 1989). "Viral Gastroenteritis Aboard a Cruise Ship". The Lancet. 334 (8669): 961–65. doi:10.1016/s0140-6736(89)90964-1. ISSN0140-6736. PMID2571872. S2CID29429652.
Best, E.L.; Sandoe, J.a.T.; Wilcox, M.H. (1 January 2012). "Potential for aerosolization of Clostridium difficile after flushing toilets: the role of toilet lids in reducing environmental contamination risk". The Journal of Hospital Infection. 80 (1): 1–5. doi:10.1016/j.jhin.2011.08.010. ISSN1532-2939. PMID22137761.