Gaya APA
Asimov, Isaac. (1992).
Why Does Litter Cause Problems? .
Mexico:
Gareth Steven Publishing.
Gaya Chicago
Asimov, Isaac.
Why Does Litter Cause Problems?.
Mexico:
Gareth Steven Publishing,
1992.
Text.
Gaya MLA
Asimov, Isaac.
Why Does Litter Cause Problems?.
Mexico:
Gareth Steven Publishing,
1992.
Text.
Gaya Turabian
Asimov, Isaac.
Why Does Litter Cause Problems?.
Mexico:
Gareth Steven Publishing,
1992.
Print.