«Aveleda». web.archive.org. 8 March 2018. Arkivert frå originalen 8. mars 2018. Henta 18 November 2019.
books.google.com
American Society of Landscape Architects. Garden designArkivert 2. mai 2014 ved Wayback Machine. – Volume 18, Issue 5. 1999. "...Silva da Fonseca, began developing the gardens on a grander scale and building their architectural follies in the 1820s. These are painstakingly maintained today: a stone goat tower three stories high with a spiral ramp of logs..."
American Society of Landscape Architects. Garden designArkivert 2. mai 2014 ved Wayback Machine. – Volume 18, Issue 5. 1999. "...Silva da Fonseca, began developing the gardens on a grander scale and building their architectural follies in the 1820s. These are painstakingly maintained today: a stone goat tower three stories high with a spiral ramp of logs..."