Gaya APA
dkk, D, M.
(1985).
World Geography Today
.
Hoboken, NJ:
Holt Rinehart andwinston,Publisher.
Gaya MLA
dkk, David, M.Helgren.
"World Geography Today".
Hoboken, NJ:
Holt Rinehart andwinston,Publisher,
1985.
Text.