There's a book about the campaign, haven't seen it myself though:
https://www.amazon.co.uk/Air-Launche...70_&dpSrc=srch
P.S. The He 111 H-22 is a bit of a myth — the type does not appear in the KG 53 and KG 3 unit strength or loss reports that I've seen, their air-launching aircraft are described as He 111 H-20. I suspect that the H-22 was a planned variant that fell victim to the end of He 111 production and that existing H-20 models were converted instead.