@book{Strauss,1990,
author = {Strauss, A. and Corbin, J. and others},
title = {Basics of qualitative research},
year = {1990},
publisher = {Sage},
language = {English},
url = {www.li.suu.edu/library/circulation/Stein/Comm%206020ksStraussCorbinBasicsQualitativeFall07.pdf}
}