There are a lot of choices from very simple (resistor divider or zener diod reference) to complex step down switching regulators. The essential question is how much current (and/or power) you need at 5V side. Reply please.
The designer needs to clarify the current ratings of source and load .
ex: say 10amps load , none of the suggested solutions seem feasible .
For glitches /ripple at input /pulsed loads ,special design are needed.