Willen, B., Strals, N., & Lupton, E. (2009). Lettering & type: Creating letters and designing typefaces. Princeton Architectural Press.

Willen, Bruce, Nolen Strals, and Ellen Lupton. Lettering & Type: Creating Letters and Designing Typefaces. New York: Princeton Architectural Press, 2009.

Willen, Bruce, et al. Lettering & Type: Creating Letters and Designing Typefaces. Princeton Architectural Press, 2009.