Cita APA (7th ed.)

Robson, E., & Freeman, E. (2006). Head first HTML with CSS & XHTML. O'Reilly Media, Inc.

Cita Chicago (17th ed.)

Robson, Elisabeth, i Eric Freeman. Head First HTML with CSS & XHTML. Sebastopol, CA: O'Reilly Media, Inc, 2006.

Cita MLA (9th ed.)

Robson, Elisabeth, i Eric Freeman. Head First HTML with CSS & XHTML. O'Reilly Media, Inc, 2006.