Punch, Keith Francis.

    Introduction to social research : quantitative & qualitative approaches / Keith F. Punch. 3rd ed.

    London [etc.] : SAGE Publications, 2014. XVI, [6], 386 s. : il. ; 23 cm.
    ISBN 978-1-4462-4092-2     ISBN 978-1-4462-4093-9

   
T.17719        UKD: 303.4/.8=111