Fink, Arlene. How To Sample in Surveys : Volume 7 / Arlene Fink. - 2nd edition. - Thousand Oaks, CA : Sage publications, Inc., 2002. - 88 p. - The Survey Kit 2Ed vol. 7. . ISBN: 0-7619-2577-5 978-0761-925774 Subjects--Topical Terms: Surveys