There are two excellent books by Peter Hart, main oral historian at the Imperial War Museum-- Bloody April. Slaughter in the Skies over Arras 1917 (2006) and Aces Falling. War Above the Trenches, 1918 (2008). They are based on and include excerpts from numerous firsthand accounts, both oral and written. They're aimed at a general audience more than academic, so don't really engage with the historiography, but since you only want to 'glance' I imagine that's fine.

Also, definitely have a look at the Red Baron's own autobiography, The Red Battle Flyer, written and published in 1917 (English edition published 1918). It's available online at Project Gutenberg: http://www.gutenberg.org/files/41159/41159-h/41159-h.htm

This is an article from Sabretache, the journal of the Military History Society of Australia it explores in depth the circumstances surrounding the death of Manfred von Richtofen. In particular, it examines the possible causes of his death and who fired the fatal shot. Ultimately, the author of the article determines that the fatal shot had to have come from an Australian soldier on the ground, Sergeant Popkin.