Electrode Placement Manual
Electrode placement manual shows the surface skin electrode positioning for NMES (neuro-muscular stimulation). These charts are also useful for EMG and ETS placement, as the very same positioning could be used not only to apply electrical stimulation, but also to measure EMG from the very same muscle groups.
Electrodes placement in PDF version:
http://veritymedical.co.uk/upload/leaflets/electrode-placement-EN.pdf