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- BURT, James E. - BARBER, Gerald M. - RIGBY, D.L. Elementary statistics for geographers. 3rd ed. New York : Guilford Press, 2009. 653 s. ISBN 978-1-57230-484-0. [Copy count : 1, currently available 0, at library only 1]
book
- RIGBY, D.L. The existence, significance, and persistence of profit rate differentials. In Economic Geography, 1991, roč. 67, č. 3, s. 210-223.
article