For a Squadron history I would recommend:
“We Wage War by Night”: An Operational and Photographic History of No.622 Squadron RAF Bomber Command
(Schiffer Publishing 2011)
by Howard J. Sandall (622 Squadron historian)
336 pages w/ 400+ b&w photos
hardback
$69.99
"622 Sqdn. was just one of many Bomber Squadrons whose airmen carried out nightly missions, putting their lives “on the line” for King and Country during WWII. This account is relayed through the memoirs, diaries and letters of the men and women who fought and died throughout this dark period. These young men came from all parts of the Commonwealth to unite under the banner of freedom and democracy. By war’s end, they had forged themselves into one of the most formidable fighting forces in the history of air warfare."
https://www.schifferbooks.com/we-wag...mand-1055.html