„Structure of the LC Control Number”. Network Development and MARC Standards Office. Library of Congress. 16. 6. 2006. Arhivirano iz originala 24. 2. 2011. g. Pristupljeno 18. 1. 2021.
„The LCCN Namespace”. Network Development and MARC Standards Office. Library of Congress. 10. 11. 2003. Arhivirano iz originala 30. 10. 2017. g. Pristupljeno 18. 1. 2021.
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„Structure of the LC Control Number”. Network Development and MARC Standards Office. Library of Congress. 16. 6. 2006. Arhivirano iz originala 24. 2. 2011. g. Pristupljeno 18. 1. 2021.
„The LCCN Namespace”. Network Development and MARC Standards Office. Library of Congress. 10. 11. 2003. Arhivirano iz originala 30. 10. 2017. g. Pristupljeno 18. 1. 2021.