Ram Singh. (2009). International trade: Operations. Excel books.
Dyfyniad Arddull ChicagoRam Singh. International Trade: Operations. New Delhi: Excel books, 2009.
Dyfyniad MLARam Singh. International Trade: Operations. Excel books, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.