Cita APA (7th ed.)

Evans, I. O. (1966). The observer's book of flags: By I.O. Evans (Rev. ed.). Warne.

Cita Chicago (17th ed.)

Evans, Idrisyn Oliver. The Observer's Book of Flags: By I.O. Evans. Rev. ed. London [u.a.]: Warne, 1966.

Cita MLA (8th ed.)

Evans, Idrisyn Oliver. The Observer's Book of Flags: By I.O. Evans. Rev. ed. Warne, 1966.