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Gaya APA
Astronomy A Textbook. (1946).
New York:
Harper & Brothers Publishers.
Gaya Chicago
Astronomy A Textbook.
.
New York:
Harper & Brothers Publishers,
1946.
Text.
Gaya MLA
Astronomy A Textbook.
.
New York:
Harper & Brothers Publishers,
1946.
Text.
Gaya Turabian
Astronomy A Textbook.
New York:
Harper & Brothers Publishers,
1946.
Print.