Gaya APA
Grolier, . (1993).
Encyclopedia Of Knowledge volume 20 (WORCESTER - ZYGOTE) (1st ed. - ).
India:
Grolier Incorporated.
Gaya MLA
Grolier, .
"Encyclopedia Of Knowledge volume 20 (WORCESTER - ZYGOTE)".
1st ed. -
India:
Grolier Incorporated,
1993.
Buku Teks.