Bias, R. G., & Mayhew, D. J. (2005). Cost-justifying usability: An update for an Internet age (2nd ed.). Morgan Kaufman.
Chicago Style (17th ed.) ZitazioaBias, Randolph G., eta Deborah J. Mayhew. Cost-justifying Usability: An Update for an Internet Age. 2nd ed. Amsterdam ; Boston: Morgan Kaufman, 2005.
MLA (9th ed.) ZitazioaBias, Randolph G., eta Deborah J. Mayhew. Cost-justifying Usability: An Update for an Internet Age. 2nd ed. Morgan Kaufman, 2005.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.