« The Gardens of Alcatraz », Alcatraz Gardens Project, Alcatrazgardens.org, National Park Service, The Gardens Conservancy, The Golden Gate National Parks Gardens Conservancy, (consulté le ) : « At the top of the main road are the ruins of the warden’s house, which included a small greenhouse built for Warden Swope’s wife Edna. Inmate Elliott Michener said he gained “a lasting interest in creativity” from eight years of building gardens on the west side. Near the end of his sentence he was promoted to the warden’s house, and after parole he wrote to the warden, “For the first time I’m learning how much better one can do living honestly than by, say, counterfeiting! We have cars and fat bank accounts... And we have a favor to ask: will you send us a bush of our old ‘Gardenia’ rose?” ».
Adam Fortunate Eagle et Golden Gate National Park Association, Alcatraz! Alcatraz!: the Indian occupation of 1969–1971, Heyday Books, (ISBN978-0-930588-51-9, lire en ligne), p. 84
BMI Staff et Tina Dittbenner Morgan, Al Capone Does My Shirts Study Guide and Student Workbook, BMI Educational Services, (ISBN978-1-60933-701-8, lire en ligne), p. 66
Mary K. Grassick, Fort Point: Fort Point National Historic Site, Presidio of San Francisco, California, Division of Historic Furnishings, Harpers Ferry Center, National Park Service, (lire en ligne), p. 128
Historical Records Survey (U.S.), National Archives Project, Survey of Federal Archives (U.S.) et National Archives (U.S.), Inventory of federal archives in the states, Historical Records Survey, (lire en ligne), p. 1935
George H. Gregory, Alcatraz Screw: My Years as a Guard in America's Most Notorious Prison, University of Missouri Press, , 151– (ISBN978-0-8262-1396-9, lire en ligne)