Gaya APA
Downs, Robert B. (2004).
Books at Changed The World .
USA:
Signet classic.
Gaya Chicago
Downs, Robert B.
Books at Changed The World.
USA:
Signet classic,
2004.
Text.
Gaya MLA
Downs, Robert B.
Books at Changed The World.
USA:
Signet classic,
2004.
Text.
Gaya Turabian
Downs, Robert B.
Books at Changed The World.
USA:
Signet classic,
2004.
Print.