Gaya APA
Blachford, S, L., Krapp, K. (2003).
Drugs and Controlled Substances Information for Students .
America:
GALE THOMSON.
Gaya MLA
Blachford, Stacey, L.., Krapp, Kristine.
"Drugs and Controlled Substances Information for Students".
America:
GALE THOMSON,
2003.
Buku Text.