Gaya APA
Downs, Robert B. (1956).
Books that changed the world .
New York:
Mentor Book.
Gaya Chicago
Downs, Robert B.
Books that changed the world.
New York:
Mentor Book,
1956.
Text.
Gaya MLA
Downs, Robert B.
Books that changed the world.
New York:
Mentor Book,
1956.
Text.
Gaya Turabian
Downs, Robert B.
Books that changed the world.
New York:
Mentor Book,
1956.
Print.