Singh, I. J. (1995). Transport economy: Comparative study of Punjab,Haryana roadways. Anmol publication.
Dyfyniad Arddull ChicagoSingh, Inder Jit. Transport Economy: Comparative Study of Punjab,Haryana Roadways. New Delhi: Anmol publication, 1995.
Dyfyniad MLASingh, Inder Jit. Transport Economy: Comparative Study of Punjab,Haryana Roadways. Anmol publication, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.