MLA
Flacius Illyricus, Matthias, 1520-1575, author. Ethnica Iesvitarum doctrina de duobus praecipuis Christianae fidei articulis, : nempe de expiatione remissioneq[ue] peccatorum: ac de iustificatione aut iustitia Christi, qua Christiani iustificantur: ex eorum autentico, magnisq[ue] bullis confirmato Catechismo, ad verbum descripta .... 1564. Richard C. Kessler Reformation Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/078gf1vjsh-cor.
APA, 6th edition
Flacius Illyricus, Matthias, 1520-1575, author. (1564)[Ethnica Iesvitarum doctrina de duobus praecipuis Christianae fidei articulis, : nempe de expiatione remissioneq[ue] peccatorum: ac de iustificatione aut iustitia Christi, qua Christiani iustificantur: ex eorum autentico, magnisq[ue] bullis confirmato Catechismo, ad verbum descripta ...]. Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/078gf1vjsh-cor.
Chicago
Flacius Illyricus, Matthias, 1520-1575, author, Ethnica Iesvitarum doctrina de duobus praecipuis Christianae fidei articulis, : nempe de expiatione remissioneq[ue] peccatorum: ac de iustificatione aut iustitia Christi, qua Christiani iustificantur: ex eorum autentico, magnisq[ue] bullis confirmato Catechismo, ad verbum descripta ..., 1564, Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/078gf1vjsh-cor.