Gaya APA
Federal regulations, volume 4. (1981).
New Jersey:
Prentice-Hall.
Gaya Chicago
Federal regulations, volume 4.
text.
New Jersey:
Prentice-Hall,
1981.
Tesis.
Gaya MLA
Federal regulations, volume 4.
text.
New Jersey:
Prentice-Hall,
1981.
Tesis.
Gaya Turabian
Federal regulations, volume 4.
New Jersey:
Prentice-Hall,
1981.
Tesis.