Gaya APA
Allen, john L. (2000).
Annual editions: Environment (Ed.19).
America:
the Mc Graw-Hill.
Gaya Chicago
Allen, john L.
Annual editions: Environment.
Ed.19
America:
the Mc Graw-Hill,
2000.
.
Gaya MLA
Allen, john L.
Annual editions: Environment.
Ed.19
America:
the Mc Graw-Hill,
2000.
.
Gaya Turabian
Allen, john L.
Annual editions: Environment.
Ed.19
America:
the Mc Graw-Hill,
2000.
.