Webb, E. (1966). Unobtrusive measures: Nonreactive research in the social sciences. Rand McNally College publ Co..
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Dyfyniad Arddull Chicago
Webb, Eugene. Unobtrusive Measures: Nonreactive Research in the Social Sciences. Chicago: Rand McNally College publ Co., 1966.
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Dyfyniad MLA
Webb, Eugene. Unobtrusive Measures: Nonreactive Research in the Social Sciences. Rand McNally College publ Co., 1966.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.