Tolong jelaskan mengenai Lihat pula dari Hans Singer

Sapsford, David and John-Ren Chen, Development Economics and Policy: The Conference Volume to Celebrate the 85th Birthday of Professor Sir Hans Singer Palgrave MacMillan, 1998. ISBN 0-312-21041-8

The origins and interpretation of the Prebisch-Singer thesis . John Toye and Richard Toye. History of Political Economy, 35, 3: 437–467