Gaya APA
Speier, Gregory. (1992).
The Pan American Institute of Highways .
:
s.n..
Gaya Chicago
Speier, Gregory.
The Pan American Institute of Highways.
:
s.n.,
1992.
Computer Software.
Gaya MLA
Speier, Gregory.
The Pan American Institute of Highways.
:
s.n.,
1992.
Computer Software.
Gaya Turabian
Speier, Gregory.
The Pan American Institute of Highways.
:
s.n.,
1992.
Computer Software.