"reach the source" is correct and usable in written English.
You can use it when you want to talk about the process of going to the origin of something, or of finding a primary source of information. For instance, "I am determined to reach the source of this problem and solve it."
To reach the source of the aroma, however, he would have to go down a steep flight of stairs, seventeen of them.
Without exception, the experienced fathers would quickly cross a bridge to reach the source of the distress cry, arriving within 45 seconds.
And then we reach the source of that sound: swarms of well-wishers welcoming us to Manhattan as if we were a gold medal marathoner entering the Olympic Stadium.
It is through the grasp of the various planes of being, through ascending in knowledge to the world of the intellect and apprehending what is above it the divine will and the world of the Deity that humans may "escape death" and reach "the source of life".
Rulers of West African states had made pilgrimages to Mecca before Mansa Mūsā, but the effect of his flamboyant journey was to advertise both Mali and Mansa Mūsā well beyond the African continent and to stimulate a desire among the Muslim kingdoms of North Africa, and among many of European nations as well, to reach the source of this incredible wealth.
T i is time needed for the emitter's signal to reach the source i.
"We have reached the source.
But once he reached the source, he saw what he feared — a skull and human jaw.
Struggling to find openings for his own punches while attempting to prevent Calzaghe from reaching the source of the problem, he could never find the speed or the penetration to disrupt a performance that will now define the Welshman's remarkable career.
This indicates that the rupture terminated before reaching the source region of the largest aftershock.
Once the RREP reaches the source node, the flow transmission can begin and every node along the path knows at which TUs it must forward the flow.
