APA Style
Grolier Academic Encyclopedia: Index.-Vol.21.-. (1983).
U.S.A.:
Grolier International.
Chicago Style
Grolier Academic Encyclopedia: Index.-Vol.21.-.
Vol.21.
U.S.A.:
Grolier International,
1983.
Text.
MLA Style
Grolier Academic Encyclopedia: Index.-Vol.21.-.
Vol.21.
U.S.A.:
Grolier International,
1983.
Text.
Turabian Style
Grolier Academic Encyclopedia: Index.-Vol.21.-.
U.S.A.:
Grolier International,
1983.
Print.