Kolts, Bertram S. (2005). "Understanding Linearity and Monotonicity" (PDF). analogZONE. Archived from the original (PDF) on February 4, 2012. Retrieved September 24, 2014. https://web.archive.org/web/20120204065155/http://www.analogzone.com/nett1108.pdf
Kolts, Bertram S. (2005). "Understanding Linearity and Monotonicity". Foreign Electronic Measurement Technology. 24 (5): 30–31. Retrieved September 25, 2014. http://caod.oriprobe.com/articles/9294129/Understanding_Linearity_and_Monotonicity.htm
"Independent Linearity definition". Novotechnik Technical Reference Guide. 6 February 2021. Retrieved 2018-10-28. https://www.novotechnik.com/technology/tech_reference.html#Independent-linearity