Peter J Aspinall, Estimating the size and composition of the lesbian, gay, and bisexual population in Britain (PDF), 2009, p. 13. URL consultato il 27 agosto 2018 (archiviato dall'url originale il 24 settembre 2015).
«The Ellison and Gunstone online survey (2009) for the Commission of over 5,000 people indicates that all methods involving interviewing in a person’s home, whether face-to-face or by telephone, may incur misreporting, especially when another person is present. Respondents report that they would be least likely to conceal their sexual orientation (by switching to another sexual orientation category) when self-completion online surveys are used.»
