Smith, T. L., & Zopf, P. E. (1970). Principles of inductive rural sociology. F. A. Davis Co..
Lua i Stíl Chicago (17ú heag.)Smith, T. Lynn, agus Paul E. Zopf. Principles of Inductive Rural Sociology. Philadelphia: F. A. Davis Co., 1970.
Lua MLA (8ú heag.)Smith, T. Lynn, agus Paul E. Zopf. Principles of Inductive Rural Sociology. F. A. Davis Co., 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.