1. *** Order of the Ministry of National Education. 4887 / 08.26.2013, Curricula for Philosophy for Children (school curriculum). Brink-Budgen, Roy Van Den, (2000). Critical Thinking for Students, Learn the skills of critical assessment and effective argument 3rd Edition, Oxford: How To Books Ltd.
2. Critical Thinking in primary;Chereja,2004
3. Let's think together, teacher manual book “Sânziana”,;Gazzard,1993
4. Sânziana (original title Elfie);Lipman,1993