Davisson, Budd: "Bede's BD-4," March, 1991, Air Progress, (as OCR-scanned and posted on the author's website as "Jim Bede's High-speed Packing Crate: the BD-4: A classic, fast mover"), retrieved June 24, 2023
"AGAC AA-1." February 26, 2001, updated October 29, 2019, Aviation Consumer, retrieved June 24, 2023; notes: "The AA-1 started life in 1963 as the BD-1," and "The flight characteristics of the original airplane were, in general, quite bad," and "the AA-1 has a safety record much worse than average for this class of airplane."
