The Ruhr;
a study in historical and economic geography,
by Norman J. G. Pounds.
APA Citation
Pounds, N. John Greville. (1968). The Ruhr: a study in historical and economic geography. New York: Greenwood Press.
MLA Citation
Pounds, Norman John Greville. The Ruhr: a Study In Historical And Economic Geography. New York: Greenwood Press, 1968.
Warning: These citations may not always be complete (especially for serials).