Douglas DC-2 : DC-1, DC-2, DC-2K, R2D-1, C-32, C-32A, C-33, C-34, C-38, C-39, C-42 in civil and military service / Stan Dudek, Michal Ovčáčík, Karel Susa .  Prague :  MARK I,  c2004 .  83 s.