Gaya APA

Koh, A., Goh, V. (2010). Earth Our Home 2nd Edition Secondary 1 (2nd Edition). Singapore: Marshall Cavendish Education.

Gaya MLA

Koh, Andy., Goh, Valerie. "Earth Our Home 2nd Edition Secondary 1". 2nd Edition Singapore: Marshall Cavendish Education, 2010. Book.