Karlgren, A., & Barwell, A. (1927). Bolshevist Russia. G. Allen & Unwin.
Lua i Stíl Chicago (17ú heag.)Karlgren, Anton, agus Anna Barwell. Bolshevist Russia. London: G. Allen & Unwin, 1927.
Lua MLA (8ú heag.)Karlgren, Anton, agus Anna Barwell. Bolshevist Russia. G. Allen & Unwin, 1927.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.