APA Style
Hartmann, William K.. (1991).
Astronomy : the cosmic journey (6th ed).
USA:
Wadsworth.
Chicago Style
Hartmann, William K..
Astronomy : the cosmic journey.
6th ed
USA:
Wadsworth,
1991.
Textbook.
MLA Style
Hartmann, William K..
Astronomy : the cosmic journey.
6th ed
USA:
Wadsworth,
1991.
Textbook.
Turabian Style
Hartmann, William K..
Astronomy : the cosmic journey.
6th ed
USA:
Wadsworth,
1991.
Textbook.