Pointer, M. R., & Attridge, G. G. (1997). Some aspects of the visual scaling of large colour differences. Color Research & Application, 22(5), 298. https://doi.org/10.1002/(sici)1520-6378(199710)22:5<298::aid-col3>3.3.co;2-r
Chicago Style (17th ed.) CitationPointer, M. R., and G. G. Attridge. "Some Aspects of the Visual Scaling of Large Colour Differences." Color Research & Application 22, no. 5 (1997): 298. https://doi.org/10.1002/(sici)1520-6378(199710)22:5<298::aid-col3>3.3.co;2-r.
MLA (9th ed.) CitationPointer, M. R., and G. G. Attridge. "Some Aspects of the Visual Scaling of Large Colour Differences." Color Research & Application, vol. 22, no. 5, 1997, p. 298, https://doi.org/10.1002/(sici)1520-6378(199710)22:5<298::aid-col3>3.3.co;2-r.