There are many ways in whch knowledge can be represented. In some the knowledge is explict including logic representation, frames, and scripts as well as semantic network representations. In addition, knowledge may have more diffuse representation in sub-symbolic methods such as latent spaces or the weights of neural network.
Used in Chap. 1: page 5; Chap. 2: pages 12, 23; Chap. 3: pages 27, 33; Chap. 18: pages 271, 277, 280