Gaya APA
Vol.18, G, E, O, K.
(1993).
Grolier encyclopedia of knowledge Vol.18 / Grolier Incorporated
.
:
.
Gaya MLA
Vol.18, Grolier, Encyclopedia, Of, Knowledge.
"Grolier encyclopedia of knowledge Vol.18 / Grolier Incorporated".
:
,
1993.
Referensi.