Gaya APA
Orr, Fred. (1992).
Study Skills For Successful (Cet.1).
singpore:
George Allen & Unwin.
Gaya Chicago
Orr, Fred.
Study Skills For Successful.
Cet.1
singpore:
George Allen & Unwin,
1992.
Text.
Gaya MLA
Orr, Fred.
Study Skills For Successful.
Cet.1
singpore:
George Allen & Unwin,
1992.
Text.
Gaya Turabian
Orr, Fred.
Study Skills For Successful.
Cet.1
singpore:
George Allen & Unwin,
1992.
Print.