Leedy,, Paul D.
Practical research : planning and design / Paul D. Leedy, Jeanne Ellis Ormrod
Practical research : planning and design / Paul D. Leedy, Jeanne Ellis Ormrod
. - 9th ed.
. - Boston : Pearson Education International, cop. 2010
. - XVII, 336 p. : il 28 cm
0-13-136566-5 Brochado978-0-13-136566-7
001.891