It would be great if anyone has a suggestion on which text to perform this graph analysis on. Ideally the ones with succinct text like SICP, licensed openly, and with less dependency on visual diagrams. This is so that the model is closer to the actual "abstract-syntax-tree" structure of the book.

This is essentially a bag-of-words comparisons. Edges are computed with tf-idf similarity.

As you may discover from the graph, section 4.1, where the "Maxwell equations of software" resides in, is among the nodes with the most number of connections with other nodes.