Ricardo Baeza-Yates, Berthier Ribeiro-Neto, Modern Information Retrieval: The Concepts and Technology behind Search, Chapter 11: Web Retrieval, accessed November 2020 ¶
Ricardo Baeza-Yates, Berthier Ribeiro-Neto, Modern Information Retrieval: The Concepts and Technology behind Search, Slides for Chapter 11: Web Retrieval, accessed November 2020 ¶
Ricardo Baeza-Yates, Berthier Ribeiro-Neto, Modern Information Retrieval: The Concepts and Technology behind Search, Slides for Chapter 12: Web Crawling, accessed November 2020 ¶
Christopher D. Manning, Prabhakar Raghavan and Hinrich Schütze, Introduction to Information Retrieval, Chapter 19, 20, 21, accessed November 2020 ¶