APA Style
Writing Skills 1. (2013).
Singapore:
Alston Publishing.
Chicago Style
Writing Skills 1.
.
Singapore:
Alston Publishing,
2013.
Text.
MLA Style
Writing Skills 1.
.
Singapore:
Alston Publishing,
2013.
Text.
Turabian Style
Writing Skills 1.
Singapore:
Alston Publishing,
2013.
Print.