Evans, I. O. (1975). The observer's book of flags: By I.O. Evans (Rev. ed.). Warne.

Evans, Idrisyn Oliver. The Observer's Book of Flags: By I.O. Evans. Rev. ed. London [u.a.]: Warne, 1975.

Evans, Idrisyn Oliver. The Observer's Book of Flags: By I.O. Evans. Rev. ed. Warne, 1975.