Cohen,, Louis,, 1928-
Research methods in education / Louis Cohen, Lawrence Manion and Keith Morrison
Research methods in education / Louis Cohen, Lawrence Manion and Keith Morrison
. - 6th ed
. - London : Routledge, imp. 2008
. - XVIII, 638 p. 25 cm
0-415-36878-2 Brochado978-0-415-36878-0
37.012