APA

Mann H. K., Hollnsteiner J., . (1925). The lives of the popes in the early Middle Ages. St. Louis, Mo: .

Chicago

Mann Horace K, Hollnsteiner Johannes, . 1925. The lives of the popes in the early Middle Ages. St. Louis, Mo: .

Harvard

Mann H. K., Hollnsteiner J., . (1925). The lives of the popes in the early Middle Ages. St. Louis, Mo: .

MLA

Mann Horace K, Hollnsteiner Johannes, . The lives of the popes in the early Middle Ages. St. Louis, Mo: . 1925.