With those old authors, you get the sense they actually thought a minute about how mercenary units might work. It was a primary derivative work, derived from lots of reading history books and non-fiction books on military. The "Northwind Highlanders" as depicted in the nineties book OTOH are a romanticistic wish fulfillment of the author, based on reading Battletech novels and Battletech sourcebooks AND misinterpreting them.I don't want to be in that second catagory, so if BattleTech had an Appendix N: Inspirational and Educational Reading then what would be in it? Name some non-fiction books... oh, why discriminate? Can you name any books (whether non-fiction, fiction, colouring, pop-up or scratch-n-sniff, but under no circumstances BattleTech) which ought be included for a BattleTech bibliography?
Really, I don't know. That's why I'm posing the question.