Armstrong, E. C. R. (1913). Irish Seal-Matrices and seals: By E. C. R. Armstrong. Hodges & Figgis.
Cita Chicago (17th ed.)Armstrong, E. C. R. Irish Seal-Matrices and Seals: By E. C. R. Armstrong. Dublin: Hodges & Figgis, 1913.
Cita MLA (8th ed.)Armstrong, E. C. R. Irish Seal-Matrices and Seals: By E. C. R. Armstrong. Hodges & Figgis, 1913.
Atenció: Aquestes cites poden no estar 100% correctes.