APA Style
Bois, William Pene Du. (1947).
The Twenty-One Balloons .
New York:
Puffin Books.
Chicago Style
Bois, William Pene Du.
The Twenty-One Balloons.
New York:
Puffin Books,
1947.
Text.
MLA Style
Bois, William Pene Du.
The Twenty-One Balloons.
New York:
Puffin Books,
1947.
Text.
Turabian Style
Bois, William Pene Du.
The Twenty-One Balloons.
New York:
Puffin Books,
1947.
Print.