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Gaya APA
A Brief Text In Astronomy. (1959).
USA:
Henry Holt and Company.
Gaya Chicago
A Brief Text In Astronomy.
Ed Revised.
USA:
Henry Holt and Company,
1959.
Text.
Gaya MLA
A Brief Text In Astronomy.
Ed Revised.
USA:
Henry Holt and Company,
1959.
Text.
Gaya Turabian
A Brief Text In Astronomy.
USA:
Henry Holt and Company,
1959.
Print.