Studie Karla Veverky se zabývá mešními díly hudebního skladatele Antonia Caldary, jejichž opisy se dochovaly v hudebních sbírkách v Praze, se zaměřením na významnou sbérku hudebnin z kůru pražských křižovníků., This study deals with individual aspects and problems of research on the Masses by Antonio Caldara with source materials held in Prague. Representing the basic material are two copies from the collection of the Knights of the Cross with the Red Star along with concordant sources amassed from Czech and foreign archives. The effectiveness of the standard methods used for studying musical sources is put to the test on a selected sampling of material. The comparison of individual copies helps answer questions not only about provenience or filial relationships between materials, but also about period performance practice. The goal of the study is to make at least a partial contribution towards systematic research on the musical life of Prague in the first half of the 18th century, when Caldara’s Masses were significantly represented in church music collections., Karel Veverka., Rubrika: Studie, and Anglické resumé na s. 93, anglický abstrakt 81.