APA (7th ed.) Citation

Grigg, A. O. (1981). Rating scales: Measures of central tendency and sample sizes. Transport and Road Research Laboratory.

Chicago Style (17th ed.) Citation

Grigg, A. O. Rating Scales: Measures of Central Tendency and Sample Sizes. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1981.

MLA (9th ed.) Citation

Grigg, A. O. Rating Scales: Measures of Central Tendency and Sample Sizes. Transport and Road Research Laboratory, 1981.