(1931). Tests and challenges in sociology (for use with Ross's Principles of sociology, revised edition). The Century co.
Lua i Stíl Chicago (17ú heag.)Tests and Challenges in Sociology (for Use with Ross's Principles of Sociology, Revised Edition). New York: The Century co, 1931.
Lua MLA (9ú heag.)Tests and Challenges in Sociology (for Use with Ross's Principles of Sociology, Revised Edition). The Century co, 1931.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.