I don't know that I'd follow any gaming book necessarilly, as they sometimes have to make adjustments for fair play and such...
Squads and teams can vary greatly by any military's need. I like to envision around 12 men in a squad generally, but I can just as easily see 10, or 8 - 9 even. There's no set standard to this though written anywhere so you could make it whatever you wanted to EUCM...
Would you want a sniper for each squad? A 2-man support gun team? Those are also things to consider when figuring how you want to break these things down as well. And of course there's other specialists and whatnot.
Lots to consider.