Bealle, P. J. (1990). Obstacles and advocates: Factors influencing the introduction of modern art from Germany to New York City, 1912-33: major promoters and exhibitions.
Lua i Stíl Chicago (17ú heag.)Bealle, Penny Joy. Obstacles and Advocates: Factors Influencing the Introduction of Modern Art from Germany to New York City, 1912-33: Major Promoters and Exhibitions. Ithaca, N.Y, 1990.
Lua MLA (8ú heag.)Bealle, Penny Joy. Obstacles and Advocates: Factors Influencing the Introduction of Modern Art from Germany to New York City, 1912-33: Major Promoters and Exhibitions. 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.