Encyclopedia of mathematics Vol. 1
Kluwer Academic Publishers, 1995,
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International encyclopedia of marketing; Vol. 3
edited by A.S. Bhamhra, A.K. Chaudhary
Anmol Publications PVT, 1998
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Rourke's world of science encyclopedia vol. 8 : mathematics
Rourke Publishing LLC, 2009
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Encyclopedia of library and information science : vol. 3
Marcell Dekker, 1968
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Rourke's world of science encyclopedia vol. 3 : palnt & fungi life
Rourke Publishing LLC, 2009
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