Cita APA (7a ed.)

Choon Hoon, L., & Yee, S. O. (2000). Earth: our home: A secondary geography course ([Lower secondary course].). MPH Education.

Cita Chicago Style (17a ed.)

Choon Hoon, Lau, y Sze Onn Yee. Earth: Our Home: A Secondary Geography Course. [Lower secondary course]. Singapore: MPH Education, 2000.

Cita MLA (9a ed.)

Choon Hoon, Lau, y Sze Onn Yee. Earth: Our Home: A Secondary Geography Course. [Lower secondary course]. MPH Education, 2000.