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Gaya APA
A Brief Text in Astronomy. (1954).
USA:
Henry Holt and Company.
Gaya Chicago
A Brief Text in Astronomy.
Revised.
USA:
Henry Holt and Company,
1954.
Text.
Gaya MLA
A Brief Text in Astronomy.
Revised.
USA:
Henry Holt and Company,
1954.
Text.
Gaya Turabian
A Brief Text in Astronomy.
USA:
Henry Holt and Company,
1954.
Print.