Gaya APA
Webb,Eugene J.. (1966).
Unobtrusive measures:non reactive research in the social science/Eugene J.Webb;Donald T.Campbell;[et.al.] (Ed.9).
USA:
Rand McNally.
Gaya Chicago
Webb,Eugene J..
Unobtrusive measures:non reactive research in the social science/Eugene J.Webb;Donald T.Campbell;[et.al.].
Ed.9
USA:
Rand McNally,
1966.
.
Gaya MLA
Webb,Eugene J..
Unobtrusive measures:non reactive research in the social science/Eugene J.Webb;Donald T.Campbell;[et.al.].
Ed.9
USA:
Rand McNally,
1966.
.
Gaya Turabian
Webb,Eugene J..
Unobtrusive measures:non reactive research in the social science/Eugene J.Webb;Donald T.Campbell;[et.al.].
Ed.9
USA:
Rand McNally,
1966.
.