United States. Library of Congress. (1990). Library of Congress classification schedules combined with additions and changes through 1989: Class P, subclasses PA supplement Byzantine and Modern Greek Literature; Medieval and Modern Latin Literature. Gale Research.
Cita Chicago (17th ed.)United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class P, Subclasses PA Supplement Byzantine and Modern Greek Literature; Medieval and Modern Latin Literature. Detroit: Gale Research, 1990.
Cita MLA (9th ed.)United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class P, Subclasses PA Supplement Byzantine and Modern Greek Literature; Medieval and Modern Latin Literature. Gale Research, 1990.