The author would like to thank Werner Brog, Robert Chapleau, Jean-Loup Madre and Jose Viegas and anonymous referees for their valuable help and comments. The author, however, takes full responsibility for any remaining errors.
Bonnel, P. (2003), "Postal, Telephone, and Face-to-Face Surveys: How Comparable are They?", Jones, P. and Stopher, P. (Ed.) Transport Survey Quality and Innovation, Emerald Group Publishing Limited, pp. 215-237. https://doi.org/10.1108/9781786359551-012Download as .RIS
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