Gaya APA
ABBO, Fred E.. (1979).
Step to a longer life .
:
The world bank.
Gaya Chicago
ABBO, Fred E..
Step to a longer life.
:
The world bank,
1979.
Text.
Gaya MLA
ABBO, Fred E..
Step to a longer life.
:
The world bank,
1979.
Text.
Gaya Turabian
ABBO, Fred E..
Step to a longer life.
:
The world bank,
1979.
Print.