Working boy, 1997: t.p. (David Cullen; M.A., Univ. of Colo.) (Thesis)

Phone call to Univ. of Colo. Grad. Off., May1, 1998 (b. June 3, 1961)

Columbine, 2009: ECIP t.p. (Dave Cullen)

Email from publisher, July 22, 2008: (David Thomas Cullen; author of both Working boy and Columbine)

His website, Mar. 15, 2019 (Dave Cullen has been covering the blight of mass murders in America for two decades, first with Columbine, now Parkland: Birth of a Movement. Parkland struck while he was in year 18 of a book about two gay soldiers. He will finish that soon.)