Gaya APA
Britannica Book of The Year 1969. (1969).
United state:
William Benton.
Gaya Chicago
Britannica Book of The Year 1969.
.
United state:
William Benton,
1969.
Text.
Gaya MLA
Britannica Book of The Year 1969.
.
United state:
William Benton,
1969.
Text.
Gaya Turabian
Britannica Book of The Year 1969.
United state:
William Benton,
1969.
Print.