- A = Amberbach’s copy of the lost Codex Murbachensis completed in August 1516, now in the library of the Academy at Basle, A.N. ii. 8.
- P = Editio Princeps, printed in 1520.
- B = Burer’s readings from the Murbach Codex, which are printed at the end of the Ed. Princeps. Halm indicates these readings by the letter M.