Cita APA (7a ed.)

Wirfs-Brock, R., & McKean, A. (2009). Object design: Roles, responsibilities, and collaborations (1a. ed.). Addison Wesley.

Cita Chicago Style (17a ed.)

Wirfs-Brock, Rebecca, y Alan McKean. Object Design: Roles, Responsibilities, and Collaborations. 1a. ed. Massachusetts: Addison Wesley, 2009.

Cita MLA (8a ed.)

Wirfs-Brock, Rebecca, y Alan McKean. Object Design: Roles, Responsibilities, and Collaborations. 1a. ed. Addison Wesley, 2009.