linkedin.com (Firm), Butler, J., & Lidwell, W. (2015). Universal Principles of Design. linkedin.com.
Cita Chicago Style (17a ed.)linkedin.com (Firm), Jill Butler, y William Lidwell. Universal Principles of Design. Carpenteria, CA: linkedin.com, 2015.
Cita MLA (8a ed.)linkedin.com (Firm), et al. Universal Principles of Design. linkedin.com, 2015.
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