Gaya APA
Lewis, Erik. (2000).
As and level chemistry .
Amerika:
Longman.
Gaya Chicago
Lewis, Erik.
As and level chemistry.
Amerika:
Longman,
2000.
Buku.
Gaya MLA
Lewis, Erik.
As and level chemistry.
Amerika:
Longman,
2000.
Buku.
Gaya Turabian
Lewis, Erik.
As and level chemistry.
Amerika:
Longman,
2000.
Buku.