Não informado. (2002). Ziff Davis Smart Business. Ziff Davis Media.
Style de citation Chicago (17e éd.)Não informado. Ziff Davis Smart Business. San Francisco, Calif: Ziff Davis Media, 2002.
Style de citation MLA (8e éd.)Não informado. Ziff Davis Smart Business. Ziff Davis Media, 2002.
Attention : ces citations peuvent ne pas être correctes à 100%.