APA
u.s.library of congress.national referral center, .a directory of information resources in the united states:physical sciences;engineering. 1st ed | Washington: .
Chicago
u.s.library of congress.national referral center, .a directory of information resources in the united states:physical sciences;engineering. 1st ed | Washington: .
Harvard
u.s.library of congress.national referral center, .a directory of information resources in the united states:physical sciences;engineering. 1st ed | Washington: .
MLA
u.s.library of congress.national referral center, .1st ed | Washington: . .