Objeto do céu profundo (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Objeto do céu profundo" in Portuguese language version.

refsWebsite

Global rank Portuguese rank

5books.google.com

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books.google.com

Fred Schaaf (1998). 40 Nights to Knowing the Sky: A Night-by-Night Sky-Watching Primer. [S.l.]: Henry Holt and Company. p. 113. ISBN 978-0-8050-4668-7
Ian Ridpath (2001). The Illustrated Encyclopedia of the Universe. [S.l.]: Watson-Guptill Publications. p. 273. ISBN 978-0-8230-2512-1
Edward W. Kolb; Rocky Kolb (1999). Blind Watchers of the Sky: The People and Ideas that Shaped Our View of the Universe. [S.l.]: Oxford University Press. p. 174. ISBN 978-0-19-286203-7
Charles Anthony Federer (1942). Sky and Telescope. [S.l.]: Sky Publishing Corporation
Fred Schaaf (1998). 40 Nights to Knowing the Sky: A Night-by-Night Sky-Watching Primer. [S.l.]: Henry Holt and Company. p. 13. ISBN 978-0-8050-4668-7