Power System Grounding and Transients by A. P. "Sakis" Meliopoulos, second printing (Marcel Dekker Inc., 1988) - Purchase during online registration
IEEE Std. 80, IEEE Guide for Safety in AC Substation Grounding, 2000 edition - Purchase directly from IEEE
IEEE Std. 81, IEEE Guide for Measuring Earth Resistivity, Ground Impedance and Earth Surface Potentials of a Ground System - Purchase directly from IEEE