"A standard server is able to hold up to 32 players" is unlikely to be challenged and probably does not need to be sourced. For reference, see
http://en.wikipedia.org/wiki/Halo:_Combat_Evolved#Multiplayer . Note that the statement "The game instead uses local Ethernet or "system-link" that supports a maximum of 16 players." has no source, and the article has even been featured.
Neither will "This makes it possible for servers to run public betas or unique add-ons that server owners would otherwise not want distributed publicly, without the issue of people being unable to connect."
However, if you insist they be sourced, I took a look at the HL2 article. It suggests that it would be sourced like this:
Step One Games. Blockland. (Step One Games).
In any case, I really don't think your edits are very constructive, and I'm sure whichever admin told you to put random tags everywhere would agree with me.