Bias, R. G., & Mayhew, D. J. (2005). Cost-justifying usability: An update for an Internet age (2nd ed.). Morgan Kaufman.

Bias, Randolph G., and Deborah J. Mayhew. Cost-justifying Usability: An Update for an Internet Age. 2nd ed. Amsterdam ; Boston: Morgan Kaufman, 2005.

Bias, Randolph G., and Deborah J. Mayhew. Cost-justifying Usability: An Update for an Internet Age. 2nd ed. Morgan Kaufman, 2005.