J.P.Sommerville. «Elizabeth I: exploration and foreign policy». Arxivat de l'original el 2011-12-09. [Consulta: 20 desembre 2008]. «The wars with Spain were very expensive, even though some of the costs were offset by English privateering against Spanish ships. The pressure on royal finances forced the sale of crown lands and led Elizabeth to unpopular devices like monopolies for paying her servants.»
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J.P.Sommerville. «Elizabeth I: exploration and foreign policy». Arxivat de l'original el 2011-12-09. [Consulta: 20 desembre 2008]. «The wars with Spain were very expensive, even though some of the costs were offset by English privateering against Spanish ships. The pressure on royal finances forced the sale of crown lands and led Elizabeth to unpopular devices like monopolies for paying her servants.»