Gaya APA
The physical universe. (2000).
Boston:
McGraw-Hill.
Gaya Chicago
The physical universe.
9th.
Boston:
McGraw-Hill,
2000.
Buku.
Gaya MLA
The physical universe.
9th.
Boston:
McGraw-Hill,
2000.
Buku.
Gaya Turabian
The physical universe.
Boston:
McGraw-Hill,
2000.
Buku.