(2005). Social studies syllabus (lower secondary Normal (Technical)): Secondary 1 to 2 Normal (Technical). Ministry of Education.
Chicago-Zitierstil (17. Ausg.)Social Studies Syllabus (lower Secondary Normal (Technical)): Secondary 1 to 2 Normal (Technical). Singapore: Ministry of Education, 2005.
MLA-Zitierstil (9. Ausg.)Social Studies Syllabus (lower Secondary Normal (Technical)): Secondary 1 to 2 Normal (Technical). Ministry of Education, 2005.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.