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