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Practical research : planning and design / Paul D. Leedy ; with contributions by Timothy J. Newby and Peggy A. Ertmer.
- 001.42 L484 1997
- Leedy, Paul D.,
- Merrill,
- Upper Saddle River, N.J. :
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Educational research / Edward L. Vockell, J. William Asher.
- 370.72 V8728 1995
- Vockell, Edward L.
- Merrill,
- c1995.
- Englewood Cliffs, N.J. :