Introduction to Data Mining, Pang-Ning Tan, Michael Steinbach, and Vipin Kumar, 2005 (Pearson Education) - Offers a comprehensive overview of data mining, including detailed discussions on clustering algorithms and various evaluation techniques such as internal and external measures, and methods for selecting the number of clusters.
A cluster separation measure, David L. Davies, Donald W. Bouldin, 1979IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. PAMI-1 (IEEE)DOI: 10.1109/TPAMI.1979.4766909 - The seminal paper defining the Davies-Bouldin Index, an internal metric for evaluating clustering by considering within-cluster scatter and between-cluster distances.
Clustering.jl Documentation, JuliaStats, 2022 - Official documentation for the Julia Clustering.jl package, providing details on its API for various clustering algorithms and evaluation metrics, including Silhouette Score, Rand Index, and Mutual Information.