Bibliography
United States Copyright Office. Administrative Copyright Classification Systems .
Catalog of Copyright Entries, Cumulative Series. Motion Pictures, 1912-1939. Library of Congress. Copyright Office. 1951.
Catalog of Copyright Entries, Cumulative Series. Motion Pictures, 1940-1949. Library of Congress. Copyright Office. 1953.
Catalog of Copyright Entries, Cumulative Series. Motion Pictures, 1950-1959. Library of Congress. Copyright Office. 1960.
Catalog of Copyright Entries, Cumulative Series. Motion Pictures, 1960-1969. Library of Congress. Copyright Office. 1971.