de Leeuw, E.D., J.J. Hox, and D.A. Dillman, Mixed-mode surveys: when and why in International Handbook of Survey Methodology, E.D. de Leeuw, J.J. Hox, and D.A. Dillman, Editors. 2008, Lawrence Erlbaum Assoc Inc: New York. p. 299-316.
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Leeuw, E. D., Hox, J. J., Dillman, D. A. (2008). Mixed-mode surveys: when and why in International Handbook of Survey Methodology. New York: Lawrence Erlbaum Assoc Inc. pp. 299-316.
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