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- AAKER, David A. - KUMAR, V. - DAY, George S. Marketing research. 8. ed. Hoboken : John Wiley & Sons, Inc., 2004. 774 s. ISBN 0-471-45168-1. [Copy count : 1, currently available 0, at library only 1]
book
- KUMAR, V. - HEATH, T.B. A comparative study of market share models using disaggregate data. In International journal of forecasting, 1990, roč. 6, č. 2, s. 163-174.
article