Liberia Ministry of Education. (2011). Social studies: National curriculum for grades 1 to 6 ([Stand:] February 2011.).
Citazione stile Chigago Style (17a edizione)Liberia Ministry of Education. Social Studies: National Curriculum for Grades 1 to 6. [Stand:] February 2011. [S.l.], 2011.
Citatione MLA (9a ed.)Liberia Ministry of Education. Social Studies: National Curriculum for Grades 1 to 6. [Stand:] February 2011. 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.