Henry, Gary T. Practical sampling / Gary T. Henry. - London ; New Delhi ; Newbury Park : International Educational & Professional Publ. : Sage publ., 1990. - 139 p. - Applied social research methods series Vol. 21 . Grant OSIAFAB 2000 Includes bibliographical references. ISBN: 0-8039-2958-7 0-8039-2959-5 Subjects--Topical Terms: Sampling (statistics)Social surveys