I've been summoned! Wahaahahaaahaahahaa!
OK, all foolishness aside, there are LOTS of studies you can read, many are free and take just a quick search. However, I suggest you start with the
USDA/NRCS summary of the studies they reviewed and digested for our use (bibliography at the bottom - I've located and read about half those - the summary is consistent with their individual findings). Its not cutting edge, but its definitely good enough for the very vast majority of owners, and almost certainly bnetter than the knowledge at your typical farm/feed store. You can also check with your local Extension, where you will find largely similar info (
here is UGA's, for instance), though often repackaged in ways which may be more, or less, useful to you.
Not that when you get down into the weeds of indivudual %s of this or that, you are likely to find some amount of disagreement between sources. Best you accept a range of "acceptable" and learn to live with a little uncertainty. The studies these numbers are based on are ofen older, and primarily concerned with commercial hens, commercial management, commercial conditions - differences in breed, study methodology, and means of measurement (particularly re: Amino Acids) account for a lot of the variation - but you also should consider the study goals.
What Tyson or ConAgra or Eggland's Best wants out of a bird is helpful to us backyard owners, but not not definitive. A white leghorn's nutritional needs, at lowest possible cost, for its most productive year before becoming poultry by-product meal is a floor for the needs of a bird we plan on keeping as a pet and (incidentally) and egg layer as part of our backyard flock for 5+ years. Similarly, a Cx or Lohman Brown has different needs than the (poorly studdied) bantam frizzle in your egglu coop and run...
tl;dr - this is really good data, but you need to understand how best to use it. Oh, and of course this assumes US. If you have special needs (say, you are in the mid East or the EU, different feed mixes and calciums are likely available, we can help with some of the cutting edge studies they are doing on the local ingredients, and help you apply this info to your situation).
Hope that helps!