There is no such a reference, due to the gait pattern will depend on several factors. Between them we can mention age, genre, weight, height, and probably ethnic characteristics as inter-patient factors. On the other hand, examinator and protocol used for the markers are also a source of inter-examinator differences. However, one of the most beloved reference for this is "Perry, J.; Gait Analysis: Normal and Pathological Function, 2da ed., 1992". Take a look in the way to proceed.