SMA 160 Probability and statistics I, Module for ³Ô¹ÏÍ·Ìõ Open Learning, vetted, Published, (IOL), 2002
SMA 260 Probability and Statistics II, Module for ³Ô¹ÏÍ·Ìõ Open Learning, vetted, Published, (IOL), 2014.
“Application of loess procedure in modeling geothermal wells�. Author- Dr Gachangi Njenga and James Madegwa Etyang. Lambert Academic publishers 2016.
‘Estimation of parameters of the two parameters Rayleigh distribution� Authos;Dr Gachangi Njenga and Muriithi Daniel. ISBN-13 978-620-2-19747-2. Lambert Academic publishers ,2019