Le Breton, Preston P.
Planning theory by Preston P. Le Breton and Dale A. Henning.
Englewood Cliffs, 1961
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Le Brefon, Preston P.
General administration planning and implementation Preston P. Le Brefon
Holt, Rinehart and Winston, 1965
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Hussey, David E.
Corporate planning: theory and practice
Pergamon Press, 1976
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Long-range planning for management
edited by David W. Ewing
Harper & Brothers, 1958
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Steiner, George Albert, 1912-
Top management planning
Macmillan, 1969
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