Aragon. Ministry of the Environment. (2000). General submissions and considerations concerning the National Hydrological Plan =: Allegations et considerations generales a propos du Plan Hydrologique National. Gobierno de Aragon.
Παραπομπή σε μορφή Chicago (17η εκδ.)Aragon. Ministry of the Environment. General Submissions and Considerations Concerning the National Hydrological Plan =: Allegations Et Considerations Generales a Propos Du Plan Hydrologique National. Spain: Gobierno de Aragon, 2000.
Παραπομπή σε μορφή MLA (9th εκδ.)Aragon. Ministry of the Environment. General Submissions and Considerations Concerning the National Hydrological Plan =: Allegations Et Considerations Generales a Propos Du Plan Hydrologique National. Gobierno de Aragon, 2000.
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