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5.

THE FUTURE OF MODES OF DATA COLLECTION
by Couper, Mick P

Public opinion quarterly, 2011-01-01, Vol.75 (5), p.889-908

13.

THREE ERAS OF SURVEY RESEARCH
by Groves, Robert M

Public opinion quarterly, 2011-01-01, Vol.75 (5), p.861-871

19.

Web Survey Methods: Introduction
by Couper, M. P

Public opinion quarterly, 2008-01-01, Vol.72 (5), p.831-835

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