Cojocaru, Stefan. “Strategii de Esantionare Cantitativa in Procesul de Evaluare a Programelor”. Revista de Cercetare Si Interventie Sociala, vol. 19, Dec. 2007, pp. 115-27, https://www.rcis.ro/journal/article/view/222-strategii-de-esantionare-cantitativa-in-procesul-de.