Cita APA (7th ed.)

MacKinnon, C. R. (1966). The observer's book of heraldry. Frederick Warne.

Cita Chicago (17th ed.)

MacKinnon, Charles Roy. The Observer's Book of Heraldry. Londres: Frederick Warne, 1966.

Cita MLA (9th ed.)

MacKinnon, Charles Roy. The Observer's Book of Heraldry. Frederick Warne, 1966.