Cita APA (7a ed.)

Lin, E. R., & Yee, S. O. (2001). Our world: a closer look: [an upper secondary geography course] ([Upper secondary course], Elective.). MPH Education.

Cita Chicago Style (17a ed.)

Lin, Elizabeth R., y Sze Onn Yee. Our World: A Closer Look: [an Upper Secondary Geography Course]. [Upper secondary course], Elective. Singapore: MPH Education, 2001.

Cita MLA (9a ed.)

Lin, Elizabeth R., y Sze Onn Yee. Our World: A Closer Look: [an Upper Secondary Geography Course]. [Upper secondary course], Elective. MPH Education, 2001.