Die ältesten Quellen des orientalischen Kirchenrechtes. Erstes Buch, Die Canones Hippolity / von Dr. Phil. Hans Achelis. - Achelis, Hans, 1865-1937. (OLS)http://pul/name/4813 (J. C. Hinrischs, 1891)

Ptolemy's Almagest / translated and annotated by G. J. Toomer ; with a foreword by Owen Gingerich. - Toomer, G. J. (OLS)http://pul/name/81852; Gingerich, Owen. (OLS)http://pul/name/67213; Ptolemaeus, Claudius, 100-ca.178. (OLS)http://pul/name/71996 (Princeton University Press, 1998)
Include indice.
Bibliografia: p. [673]-681 ed in nota.