Gaya APA
Britannica Book of The Year 1973. (1973).
United state:
William Benton.
Gaya Chicago
Britannica Book of The Year 1973.
.
United state:
William Benton,
1973.
Text.
Gaya MLA
Britannica Book of The Year 1973.
.
United state:
William Benton,
1973.
Text.
Gaya Turabian
Britannica Book of The Year 1973.
United state:
William Benton,
1973.
Print.