Telephone versus face-to-face interviewing: mode effects on data quality and likely causes: report on phase II of the ESS-Gallup mixed mode methodology project

Assessing the effect of data collection mode on measurement

Jäckle, Annette, (2008)

Causes of mode effects: separating out interviewer and stimulus effects in comparisons of face-to-face and telephone surveys

Roberts, Caroline, (2012)

Data quality in telephone surveys and the effect of questionnaire length: a cross- national experiment

Roberts, Caroline, (2010)