Grigg, A. O. (1981). Rating scales: Measures of central tendency and sample sizes. Transport and Road Research Laboratory.
Chicago Style (17th ed.) CitationGrigg, A. O. Rating Scales: Measures of Central Tendency and Sample Sizes. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1981.
MLA (9th ed.) CitationGrigg, A. O. Rating Scales: Measures of Central Tendency and Sample Sizes. Transport and Road Research Laboratory, 1981.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.