United States. Library of Congress. (1990). Library of Congress classification schedules combined with additions and changes through 1989: Class Z bibliography and library science. Gale Research.
Citación estilo ChicagoUnited States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class Z Bibliography and Library Science. Detroit: Gale Research, 1990.
Cita MLAUnited States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989: Class Z Bibliography and Library Science. Gale Research, 1990.
Warning: These citations may not always be 100% accurate.