Adams, Z. W., Sumner, J. A., Danielson, C. K., Mccauley, J. L., Resnick, H. S., Grös, K., . . . Ruggiero, K. J. (2014). Prevalence and predictors of PTSD and depression among adolescent victims of the Spring 2011 tornado outbreak. Journal of Child Psychology and Psychiatry, 55(9), 1047-1055. doi:10.1111/jcpp.12220
Doswell, C. A., Iii, Carbin, G. W., & Brooks, H. E. (2012). The tornadoes of spring 2011 in the USA: An historical perspective. Weather, 67(4), 88-94. doi:10.1002/wea.1902
ExtremePlanet. (2012, July 31). Was the Tuscaloosa Tornado an EF5? Examining Aerial Damage Photographs. Retrieved December 7, 2018, from https://extremeplanet.me/tag/2011-tornado-outbreak-tuscaloosa/ (Last Photograph)
Figure 2f from: Irimia R, Gottschling M (2016) Taxonomic revision of Rochefortia Sw. (Ehretiaceae, Boraginales). Biodiversity Data Journal 4: E7720. https://doi.org/10.3897/BDJ.4.e7720. (n.d.). doi:10.3897/bdj.4.e7720.figure2f-Image on fourth page.
Knupp, K. R., Murphy, T. A., Coleman, T. A., Wade, R. A., Mullins, S. A., Schultz, C. J., . . . Klockow, K. (2014). Meteorological Overview of the Devastating 27 April 2011 Tornado Outbreak. Bulletin of the American Meteorological Society, 95(7), 1041-1062. doi:10.1175/bams-d-11-00229.1
NOAA National Centers for Environmental Information, State of the Climate: Tornadoes for April 2011, published online May 2011, retrieved on December 7, 2018 from https://www.ncdc.noaa.gov/sotc/tornadoes/201104.
Severe Tornado Outbreak in the Southern United States. (n.d.). Retrieved from https://earthobservatory.nasa.gov/images/50347/severe-tornado-outbreak-in-the-southern-united-states (Intro picture)
US Department of Commerce, & NOAA. (2016, September 29). Historic Outbreak of April 27, 2011. Retrieved December 7, 2018, from https://www.weather.gov/bmx/event_04272011
Zachary W. Adams, Carla Kmett Danielson, Jennifer A. Sumner, Jenna L. McCauley, Joseph R. Cohen & Kenneth J. Ruggiero (2015)Comorbidity of PTSD, Major Depression, and Substance Use Disorder Among Adolescent Victims of the Spring 2011 Tornadoes in Alabama and Joplin, Missouri, Psychiatry, 78:2, 170-185, DOI: 10.1080/00332747.2015.1051448