Joachim Gerich,
"Visual Analogue Scales for Mode-Independent Measurement in Self-Administered Questionnaires"
, in Behavior Research Methods, Vol. 39, Nummer 4, Seite(n) 985-992, 2007, ISSN: 1554-351X
Original Titel:
Visual Analogue Scales for Mode-Independent Measurement in Self-Administered Questionnaires