Cita APA (7a ed.)
Callihan, S. Cascading Style Sheets (CSS) by Example. Que Corporation.
Cita estilo Chicago (17a ed.)
Callihan, Steve. Cascading Style Sheets (CSS) by Example. Indianápolis, EUA: Que Corporation.
Cita MLA (9a ed.)
Callihan, Steve. Cascading Style Sheets (CSS) by Example. Que Corporation.
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