Gaya APA
Babcock, John B.. ().
Railway, Highway, and Airport Engineering .
:
s.n..
Gaya Chicago
Babcock, John B..
Railway, Highway, and Airport Engineering.
:
s.n.,
.
Globe.
Gaya MLA
Babcock, John B..
Railway, Highway, and Airport Engineering.
:
s.n.,
.
Globe.
Gaya Turabian
Babcock, John B..
Railway, Highway, and Airport Engineering.
:
s.n.,
.
Globe.