Outes-Leon, I., & Dercon, S. (2009). Survey attrition and attrition bias in Young Lives. Young Lives.
Lua i Stíl Chicago (17ú heag.)Outes-Leon, I., agus S. Dercon. Survey Attrition and Attrition Bias in Young Lives. Young Lives, 2009.
Lua MLA (9ú heag.)Outes-Leon, I., agus S. Dercon. Survey Attrition and Attrition Bias in Young Lives. Young Lives, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.