Lohr, S. L. (2010). Sampling design and analysis. Brooks/Cole Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Lohr, Sharon L. Sampling Design and Analysis. Brooks/Cole Cengage Learning, 2010.
Lua MLA (8ú heag.)Lohr, Sharon L. Sampling Design and Analysis. Brooks/Cole Cengage Learning, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.