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.