Gaya APA
The World Book Encyclopedia - Research Guide-Index. (1973).
:
.
Gaya Chicago
The World Book Encyclopedia - Research Guide-Index.
.
:
,
1973.
Text.
Gaya MLA
The World Book Encyclopedia - Research Guide-Index.
.
:
,
1973.
Text.
Gaya Turabian
The World Book Encyclopedia - Research Guide-Index.
:
,
1973.
Print.