APA aipamena

Webb, E. J. (1966). Unobtrusive measures; nonreactive research in the social sciences. Rand McNally.

Chicago Style aipamena

Webb, Eugene J. Unobtrusive Measures; Nonreactive Research in the Social Sciences. Chicago: Rand McNally, 1966.

MLA aipamena

Webb, Eugene J. Unobtrusive Measures; Nonreactive Research in the Social Sciences. Rand McNally, 1966.