Gaya APA
Downs, Robert B.. (1956).
Books That Changed The World .
New York:
The New American Library.
Gaya Chicago
Downs, Robert B..
Books That Changed The World.
New York:
The New American Library,
1956.
Text.
Gaya MLA
Downs, Robert B..
Books That Changed The World.
New York:
The New American Library,
1956.
Text.
Gaya Turabian
Downs, Robert B..
Books That Changed The World.
New York:
The New American Library,
1956.
Print.