Butler, N. M. (1934). Between two worlds: Interpretations of the age in which we live; essays and addresses. C. Scribner's Sons.
Lua i Stíl Chicago (17ú heag.)Butler, Nicholas Murray. Between Two Worlds: Interpretations of the Age in Which We Live; Essays and Addresses. New York, London: C. Scribner's Sons, 1934.
Lua MLA (8ú heag.)Butler, Nicholas Murray. Between Two Worlds: Interpretations of the Age in Which We Live; Essays and Addresses. C. Scribner's Sons, 1934.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.