APA Style
Gwinn, Robert P.. (1991).
The New Encyclopaedia Britannica World Data: Annual 1991 .
Chicago, USA:
Encyclopaedia Britannica Inc..
Chicago Style
Gwinn, Robert P..
The New Encyclopaedia Britannica World Data: Annual 1991.
Chicago, USA:
Encyclopaedia Britannica Inc.,
1991.
Text.
MLA Style
Gwinn, Robert P..
The New Encyclopaedia Britannica World Data: Annual 1991.
Chicago, USA:
Encyclopaedia Britannica Inc.,
1991.
Text.
Turabian Style
Gwinn, Robert P..
The New Encyclopaedia Britannica World Data: Annual 1991.
Chicago, USA:
Encyclopaedia Britannica Inc.,
1991.
Print.