english: More on pretesting is available in Presser and Blair (1994), Presser et al. (2004), and chapter 8 of Groves et al. (2009).
non_english: Maidir le tomhas, is é Bradburn, Sudman, and Wansink (2004) chéad acmhainn iontach chun ceistneoirí a dhearadh.