Von Der Osten, Hans Henning (Junho de 1931). «The Ancient Seals from the Near East in the Metropolitan Museum: Old and Middle Persian Seals». The Art Bulletin. 13 (2): 221–41. JSTOR3050798
Ward, David (primavera de 1982). «Yeats's Conflicts With His Audience, 1897-1917». ELH. 49 (1): 155–6. JSTOR2872885