Social presence in Web surveys. - Mick P. Couper; Roger Tourangeau; Darby M. Steiger (CHI, 2001)

Humanizing self-administered surveys: experiments on social presence in web and IVR surveys. - Roger Tourangeau; Mick P. Couper; Darby M. Steiger (Comput. Hum. Behav., 2003)