Jonathan was right (in the comments) to point out that that is a pretty narrow claim to attribute to a whole book. I would add that the claim is not made anywhere in the book. And this is where the demand for a page reference becomes important; that, at least, would make it possible to decide whether I'm right about this. As I read him, Foucault is not talking about how individuals (and certainly not "members" of "organizations") structure their experience. Revisiting the book tonight, I want to say that Foucault's point is that subjective experience is utterly unstructured by discourse. What Foucault is interested in what makes people able or unable to speak of their experiences, not what conditions them to have those experiences.
Compare a claim like "people construct their reality in social interactions" which would standardly be referenced to Berger & Luckmann 1966 (i.e., The Social Construction of Reality). Now, that whole book is certainly an argument for the claim being referenced. But if we add simply "through language", we would be obliged to tell the reader where in Berger and Luckmann's book they make that claim, and this would give us an opportunity to be a bit more precise. Is language a necessary part of the construction of reality? Is it something we merely sometimes use to that end?
Now, suppose we had said "through discourse". At this point I would begin to hesitate. How much did Berger and Luckmann actually say about "discourse" and did they mean by that in 1966 what we post-Foucauldians mean by that today? That's probably how the reference to Foucault 1972 came into play. We wanted to say "discourse" and we wanted to mean what Foucault meant. We then forgot that Foucault hadn't made the claim we were making.
*This is such a small detail that I'm not mentioning names. So I'm just assuming we're all in this together. You and I, dear readers, and the authors who wrote the original sentence.