Singapur Curriculum Planning & Development Division. (2022). Geography: Upper secondary geography textbook (First published.). Ministry of Education, Government of Singapore.
Cita Chicago Style (17a ed.)Singapur Curriculum Planning & Development Division. Geography: Upper Secondary Geography Textbook. First published. Singapore: Ministry of Education, Government of Singapore, 2022.
Cita MLA (9a ed.)Singapur Curriculum Planning & Development Division. Geography: Upper Secondary Geography Textbook. First published. Ministry of Education, Government of Singapore, 2022.
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