Ammianus Marcellinus Online consists of three works:

1. A commentary: P. de Jonge, Jan den Boeft, Daniël den Hengst, Hans C. Teitler, and Jan Willem Drijvers, Philological and Historical Commentary to Ammianus Marcellinus' Res Gestae, vols. XIV-XXXI (Leiden, 1935-2018)
2. The text edition on which commentary vols. XIV-XIX are based: C.U. Clark, Rerum gestarum libri qui supersunt (Berlin 1910)
3. The text edition on which commentary vols. XX-XXXI are based: W. Seyfarth, Rerum gestarum libri qui supersunt (Stuttgart 1978)