APA Style
The world book encyclopedia volume 21 W-X-Y-Z. (1992).
Amerika:
World book international.
Chicago Style
The world book encyclopedia volume 21 W-X-Y-Z.
volume 21.
Amerika:
World book international,
1992.
.
MLA Style
The world book encyclopedia volume 21 W-X-Y-Z.
volume 21.
Amerika:
World book international,
1992.
.
Turabian Style
The world book encyclopedia volume 21 W-X-Y-Z.
Amerika:
World book international,
1992.
.