APA Style
Wong, Thomas Hock Sun. ().
Challenging Mathematics for O Level .
:
Royal Publishing House.
Chicago Style
Wong, Thomas Hock Sun.
Challenging Mathematics for O Level.
:
Royal Publishing House,
.
Text.
MLA Style
Wong, Thomas Hock Sun.
Challenging Mathematics for O Level.
:
Royal Publishing House,
.
Text.
Turabian Style
Wong, Thomas Hock Sun.
Challenging Mathematics for O Level.
:
Royal Publishing House,
.
Print.