Gaya APA
Gordis, L.
(2009).
Epidemiology
(
Ed. 4)
.
United States of America USA:
Saunders Elseiver.
Gaya MLA
Gordis, Leon.
"Epidemiology".
Ed. 4
United States of America USA:
Saunders Elseiver,
2009.
Buku.