Bhat Sudhakar. (1975). Challenge of the North East. Popular-prakasan.
Dyfyniad Arddull ChicagoBhat Sudhakar. Challenge of the North East. Bombay: Popular-prakasan, 1975.
Dyfyniad MLABhat Sudhakar. Challenge of the North East. Popular-prakasan, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.