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Handbook on snowball sampling : 2nd draft, April 1995, including translation of chapter 3 - Fieldwork / Technical Working Group on Snowball Sampling and other Methods Book Publication Strasbourg : Council of Europe, 1995
Description 123 p. : il., tab. ; 30 cm LocationBiblioteca Vitorino Magalhães Godinho Availability Available (1).

Handbook on snowball sampling / Co-operation Group to Combat Drug Abuse and Illicit Trafficking in Drugs (Pompidou Group) ; produced by the Technical Working Group on snowball sampling and other methods ; coord. Richard Hartnoll Book Publication [s.l.] : Pompidou Group, 1997
Description 132 p. ; 29 cm LocationBiblioteca Vitorino Magalhães Godinho Availability Available (1).