Liberia Ministry of Education. (2011). History: National curriculum for grades 10 to 12 ([Stand:] February 2011.).
Citazione stile Chigago Style (17a edizione)Liberia Ministry of Education. History: National Curriculum for Grades 10 to 12. [Stand:] February 2011. [S.l.], 2011.
Citatione MLA (9a ed.)Liberia Ministry of Education. History: National Curriculum for Grades 10 to 12. [Stand:] February 2011. 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.