APA
Sethi G. S. &. S. G., .Instrument mechanic trade theory. New heights, New Delhi: .
Chicago
Sethi G S & Singh Gajendra, .Instrument mechanic trade theory. New heights, New Delhi: .
Harvard
Sethi G. S. &. S. G., .Instrument mechanic trade theory. New heights, New Delhi: .
MLA
Sethi G S & Singh Gajendra, .New heights, New Delhi: . .