
Source: Object-Oriented Software Engineering: A Use Case Driven Approach (1992), p. 42; cited in: Sten Carlsson and Benneth Christiansson. (1999) " The Concept of Object and its Relation to Human Thinking: Some Misunderstandings Concerning the Connection between Object-Orientation and Human Thinking http://www.vits.org/publikationer/dokument/289.pdf." Informatica, Lith. Acad. Sci. 10.2. p. 147-160.