Gaya APA
Environmen subsisttence and system. (1988).
united state:
Gramedia.
Gaya Chicago
Environmen subsisttence and system.
.
united state:
Gramedia,
1988.
Buku.
Gaya MLA
Environmen subsisttence and system.
.
united state:
Gramedia,
1988.
Buku.
Gaya Turabian
Environmen subsisttence and system.
united state:
Gramedia,
1988.
Buku.