Cochran, W. G. (1963). Sampling techniques (2a. ed.). John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Cochran, William Gemmell. Sampling Techniques. 2a. ed. Nueva York: John Wiley & Sons, 1963.
Lua MLA (9ú heag.)Cochran, William Gemmell. Sampling Techniques. 2a. ed. John Wiley & Sons, 1963.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.