Gaya APA
National library of medicine classification. (1994).
:
.
Gaya Chicago
National library of medicine classification.
kelima 1994.
:
,
1994.
Text.
Gaya MLA
National library of medicine classification.
kelima 1994.
:
,
1994.
Text.
Gaya Turabian
National library of medicine classification.
:
,
1994.
Print.