References
- Allison , R. B. 1963 . A two-dimensional semantic differential . J. Consult. Psychol. , 27 : 18 – 23 .
- Cliff , N. 1959 . Adverbs as multipliers . Psychol. Rev. , 66 : 26 – 44 .
- Likert , R. 1932 . A technique for the measurement of attitudes . Arch. Psychol. , No. 140