Patton, Michael Quinn.

    Qualitative research & evaluation methods / Michael Quinn Patton. 3rd ed.

    Thousand Oaks, California : Sage Publications, Inc., cop. 2002. 687 pag. varia : il. ; 26 cm.
    ISBN 978-0-7619-1971-1

   
T.12910        UKD: 311:001.891:167/168:51-7]=111