United States. Library of Congress. (1990). Library of Congress classification schedules combined with additions and changes through 1989: Class E-F History : America. Gale Research.
芝加哥风格引文United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class E-F History : America. Detroit: Gale Research, 1990.
MLA引文United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class E-F History : America. Gale Research, 1990.
警告：这些引文格式不一定是100％准确.