An Overview of Modular Smalltalk. - Allen Wirfs-Brock; Brian Wilkerson (OOPSLA, 1988)

Object-Oriented Design: A Responsibility-Driven Approach. - Rebecca Wirfs-Brock; Brian Wilkerson (OOPSLA, 1989)

Designing object-oriented software. - Rebecca Wirfs-Brock; Lauren Ruth Wiener; Brian Wilkerson (Prentice Hall, 1990)