Hewitt A.; Burbidge G. (1991). "An optical catalog of extragalactic emission-line objects similar to quasi-stellar objects". The Astrophysical Journal Supplement Series (بالإنجليزية). 75: 297–356. Bibcode:1991ApJS...75..297H. DOI:10.1086/191533. ISSN:0067-0049. QID:Q66617595.
harvard.edu
ui.adsabs.harvard.edu
Hewitt A.; Burbidge G. (1991). "An optical catalog of extragalactic emission-line objects similar to quasi-stellar objects". The Astrophysical Journal Supplement Series (بالإنجليزية). 75: 297–356. Bibcode:1991ApJS...75..297H. DOI:10.1086/191533. ISSN:0067-0049. QID:Q66617595.
Hewitt A.; Burbidge G. (1991). "An optical catalog of extragalactic emission-line objects similar to quasi-stellar objects". The Astrophysical Journal Supplement Series (بالإنجليزية). 75: 297–356. Bibcode:1991ApJS...75..297H. DOI:10.1086/191533. ISSN:0067-0049. QID:Q66617595.
worldcat.org
Hewitt A.; Burbidge G. (1991). "An optical catalog of extragalactic emission-line objects similar to quasi-stellar objects". The Astrophysical Journal Supplement Series (بالإنجليزية). 75: 297–356. Bibcode:1991ApJS...75..297H. DOI:10.1086/191533. ISSN:0067-0049. QID:Q66617595.