Gaya APA
Baker, Robert H.. (1968).
An Introduction to Astronomy (Ed. 7. --).
New York:
American Book Company.
Gaya Chicago
Baker, Robert H..
An Introduction to Astronomy.
Ed. 7. --
New York:
American Book Company,
1968.
Text.
Gaya MLA
Baker, Robert H..
An Introduction to Astronomy.
Ed. 7. --
New York:
American Book Company,
1968.
Text.
Gaya Turabian
Baker, Robert H..
An Introduction to Astronomy.
Ed. 7. --
New York:
American Book Company,
1968.
Print.