New General Catalogue (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "New General Catalogue" in Polish language version.

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klima-luft.de

Wolfgang Steinicke: NGC/IC observers. 2016-10-20. [dostęp 2017-01-11]. (ang.).
Wolfgang Steinicke: Revised New General Catalogue and Index Catalogue. 2017-05-05. [dostęp 2017-06-23]. (ang.).

observers.org

ngcicproject.observers.org

Harold G. Corwin, Jr.: An Historical Perspective. NGC/IC Project, 1999-10-12. [dostęp 2021-02-15]. (ang.).