The textbook "Travel Time Models and Throughput Analysis of Dual Load Handling Automated Storage and Retrieval Systems" by Katharina Dörr provides a comprehensive analysis of travel time models in the context of automated storage and retrieval systems. It formulates an analytical model for the quadruple command cycle in double-deep storage systems with a dual load handling device and validates it through a simulation model. The book discusses various routing and sequencing strategies and uses simulations to compare these strategies in different AS/RS configurations. The results are evaluated in relation to real-world applications, and analytical formulations are derived for selected strategies. This detailed study is particularly valuable for professionals and students in the fields of engineering and IT who are involved in optimizing automated storage systems.