Gaya APA
BELLO, I., WILLIAMS, B, K.
(1997).
USING INFORMATION TECHNOLOGY______BSD
(
Ed.2)
.
Boston:
McGraw-Hill.
Gaya MLA
BELLO, Ignacio., WILLIAMS, Brian, K..
"USING INFORMATION TECHNOLOGY______BSD".
Ed.2
Boston:
McGraw-Hill,
1997.
Text.