APA Style
The New Book Of Knowledge #21. (1992).
USA:
Grolier Incorporeted.
Chicago Style
The New Book Of Knowledge #21.
.
USA:
Grolier Incorporeted,
1992.
Text.
MLA Style
The New Book Of Knowledge #21.
.
USA:
Grolier Incorporeted,
1992.
Text.
Turabian Style
The New Book Of Knowledge #21.
USA:
Grolier Incorporeted,
1992.
Print.