Leedy,, Paul D. Practical research : planning and design / Paul D. Leedy ; colab. Timothy J. Newby, Peggy A. Ertmer

Practical research : planning and design / Paul D. Leedy ; colab. Timothy J. Newby, Peggy A. Ertmer . - 6th ed . - Upper Saddle River : Merrill, cop. 1997 . - XVI, 304 p. : il. gráficos 28 cm
0-13-241407-4 (Brochado)

001.891