APA

Sylvester, Lattin H. P., . (1961). The letters of Gerbert, with his papal privileges as Sylvester II. New York: Columbia University Press.

Chicago

Sylvester, Lattin Harriet Pratt, . 1961. The letters of Gerbert, with his papal privileges as Sylvester II. New York: Columbia University Press.

Harvard

Sylvester, Lattin H. P., . (1961). The letters of Gerbert, with his papal privileges as Sylvester II. New York: Columbia University Press.

MLA

Sylvester, Lattin Harriet Pratt, . The letters of Gerbert, with his papal privileges as Sylvester II. New York: Columbia University Press. 1961.