Penggayaan APA
Biological substances. (1987).
Geneva:
World Health Organization.
Chicago Style
Biological substances.
.
Geneva:
World Health Organization,
1987.
Buku.
MLA Style
Biological substances.
.
Geneva:
World Health Organization,
1987.
Buku.
Turabian Style
Biological substances.
Geneva:
World Health Organization,
1987.
Buku.