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Laan, Sjaak (2011). IT Infrastructure Architecture: Infrastructure Building Blocks and Concepts. Lulu Press. ISBN9781447881285Laan, Sjaak (2011). IT Infrastructure Architecture: Infrastructure Building Blocks and Concepts. Lulu Press. ISBN9781447881285 Laan, Sjaak (2011). IT Infrastructure Architecture: Infrastructure Building Blocks and Concepts. Lulu Press. ISBN9781447881285
van der Veen, Annelies; van Bon, Jan (2007). Foundations of ITIL V3. Van Haren Publishing. ISBN978-90-8753-057-0van der Veen, Annelies; van Bon, Jan (2007). Foundations of ITIL V3. Van Haren Publishing. ISBN978-90-8753-057-0 van der Veen, Annelies; van Bon, Jan (2007). Foundations of ITIL V3. Van Haren Publishing. ISBN978-90-8753-057-0