Henry Draper Catalogue (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "Henry Draper Catalogue" in Catalan language version.

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On the Henry Draper Memorial Photographs of Stellar Spectra, George F. Barker, Proceedings of the American Philosophical Society 24 (1887), pp. 166–172.

The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars, V. V. Nesterov, A. V. Kuzmin, N. T. Ashimbaeva, A. A. Volchkov, S. Röser, and U. Bastian, Astronomy and Astrophysics Supplement Series 110 (1995), pp. 367–370, Bibcode: 1995A&AS..110..367N