APA Style
Asimovs, Isaac. (1989).
Astronomy Today .
:
Asimovs, Isaac.
Chicago Style
Asimovs, Isaac.
Astronomy Today.
:
Asimovs, Isaac,
1989.
Text.
MLA Style
Asimovs, Isaac.
Astronomy Today.
:
Asimovs, Isaac,
1989.
Text.
Turabian Style
Asimovs, Isaac.
Astronomy Today.
:
Asimovs, Isaac,
1989.
Print.