Ketchum, R. What is communism? E.P Dutton & Co. Inc.
Lua i Stíl Chicago (17ú heag.)Ketchum, Richard. What Is Communism? New York: E.P Dutton & Co. Inc.
Lua MLA (9ú heag.)Ketchum, Richard. What Is Communism? E.P Dutton & Co. Inc.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.