APA Style
Lee, Helen. (2005).
Systems: Lower Block (Primary 3 & 4) .
Singapore:
Educational Publishing House PTE Ltd.
Chicago Style
Lee, Helen.
Systems: Lower Block (Primary 3 & 4).
Singapore:
Educational Publishing House PTE Ltd,
2005.
Book.
MLA Style
Lee, Helen.
Systems: Lower Block (Primary 3 & 4).
Singapore:
Educational Publishing House PTE Ltd,
2005.
Book.
Turabian Style
Lee, Helen.
Systems: Lower Block (Primary 3 & 4).
Singapore:
Educational Publishing House PTE Ltd,
2005.
Book.