Donne, Michael. Per ardua ad astra : seventy years of the RFC & the RAF / Michael Donne & Cynthia Fowler. - London : F. Muller, 1982. - 191 pages : illustrations ; 27 cm. Includes index. Bibliography: p. 189. ISBN: 0584110227 : £12.95 Subjects--Corporate Names: Great Britain. Royal Air Force --History. Subjects--Topical Terms: Aeronautics, Military--History.--Great Britain LC Class. No.: UG635.G7 / D66 1982