Gaya APA
National Health System. (1982).
Jakarta:
Bakti Usada.
Gaya Chicago
National Health System.
.
Jakarta:
Bakti Usada,
1982.
Text.
Gaya MLA
National Health System.
.
Jakarta:
Bakti Usada,
1982.
Text.
Gaya Turabian
National Health System.
Jakarta:
Bakti Usada,
1982.
Print.