Kiethl
I can't help you with any published material.
In the world of everyday airline operations all glideslopes can be, and are frequently, intercepted from above. (We could be talking semantics here however as it is all about how much 'above' the G/S you are. 500 ft above at 10 miles is probably OK depending on headwind etc, but 500 ft at 5 miles isn't OK for a jet maybe OK for a turbo-prop)
It is a requirement that you are established on the correct glidepath by a certain altitude specified by most operators in order to achieve a 'stabilised approach'. Checking you are on the correct glidepath is achieved by checking DME etc.
Regards
Exeng