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