WW1 Day Bomber books

I’m looking for reference material on British day bombers – especially anything written by pilots/observers. I have ‘Bomber Pilot 1916-18’ and ‘The Chronicles of 55 Squadron’, can anyone reccomend any others? There’s also the Naval & Military Press reprint of a history of 99 Squadron. Anything else which isn’t related to a certain Squadron and/or buy aircrew is of interest to go along with ‘First of the Many’ and ‘The origins of strategic bombing’ which I already have.

Many thanks, Rob