On the Principles of Astronomy
- ISBN 10 : OCLC:637900871
- Judul : On the Principles of Astronomy
- Pengarang : Nur Al-Din Ibn Ishaq Al-Bitruji (Astronomer),
- Bahasa : en
- Tahun : 1971
- Halaman : 0
- Google Book : http://books.google.co.id/books?id=0VQ_swEACAAJ&dq=inauthor:Ishaq&hl=&source=gbs_api
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