Harkness, J., Vijver Van de, F., & Mohler, P. (2003). Cross-Cultural Survey Methods. Wiley-Interscience.
Lua i Stíl Chicago (17ú heag.)Harkness, Janet, Fons Vijver Van de, agus Peter Mohler. Cross-Cultural Survey Methods. Hoboken (NJ): Wiley-Interscience, 2003.
Lua MLA (8ú heag.)Harkness, Janet, et al. Cross-Cultural Survey Methods. Wiley-Interscience, 2003.
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