Gaya APA

Swanson, C, P., Lewis, R. (NULL). Encyclopedia of science 11 communication print, images, sounds and ì the computer . New: New York: Macmillan Pub.Co.; 1991.

Gaya MLA

Swanson, Carl, P.., Lewis, Rhys. "Encyclopedia of science 11 communication print, images, sounds and ì the computer". New: New York: Macmillan Pub.Co.; 1991, NULL. Text.