MLA
Rabanus Maurus, Archbishop of Mainz, 784?-856, author. Magnencij Rabani Mauri de laudi[bus] Sancte Crucis opus. : erudicione versu posa[que] mirificum.. XXXX. Richard C. Kessler Reformation Collection. Pitts Theology Library. https://digital.library.emory.edu/purl/204rjdfnv2-cor.
APA, 6th edition
Rabanus Maurus, Archbishop of Mainz, 784?-856, author. (XXXX)[Magnencij Rabani Mauri de laudi[bus] Sancte Crucis opus. : erudicione versu posa[que] mirificum.]. Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/204rjdfnv2-cor.
Chicago
Rabanus Maurus, Archbishop of Mainz, 784?-856, author, Magnencij Rabani Mauri de laudi[bus] Sancte Crucis opus. : erudicione versu posa[que] mirificum., XXXX, Richard C. Kessler Reformation Collection, Pitts Theology Library. https://digital.library.emory.edu/purl/204rjdfnv2-cor.