Sebastiano Serlio, I sette Libri dell'architettura, Libro III, 1584, ristampa ed. Forni, 1987. Drawings also available at archive.org, p.157 of the b/w PDF file.
books.google.com
Schroeter Gothein, M.L., et al., A History of Garden Art, Cambridge Univ. Press, 2014, pp. 217-18.
Zecchino, Francesco, La Villa di Poggioreale, residenza degli Aragonesi a Napoli, Delpinoa, n.s.44:3–16. 2002. Accessed 2015-07-05. (The Villa Poggioreale, residence of the Aragonese in Naples.) This reference offers derived images of the property developed by scholars of the period.
web.archive.org
Another map made in 1670 shows the villa as still a prominent landmark. Baratta, Alessandro, Orlandi, Giovanni ed., (Naples, Bowinkel collection), reprinted in part in de’ Seta, Cesare, Cartografia della Citta’ di Napoli, edizioni scientifiche italiane, Naples, 1969, and in de’ Seta, Cesare, Laterza ed., Le citta’ nella storia d’Italia, Napoli, 1981, Rome-Bari; all cited by Matthews, Jeff, Poggioreale —Paradise Lost, Around Naples Encyclopedia, UMUC Italian Studies, June 2006. Accessed 2015-07-05.
The map engraving published in 1670 by Alessandro Baratta showing the Villa Poggio Reale in Naples appears to be reliable evidence of the appearance of the villa at that time, according to an auction house discussion comparing Codazzi's painting of the villa with two others that are very similar. See the Babuino Case d'Asti auction house's discussion of the Codazzi painting and two variants. Accessed 2015-07-05.
Matthews, Jeff, Air Raids on Naples in WWII, Around Naples Encyclopedia (via archive.org), UMUC Italian Studies, January 2006. Accessed 2015-07-05. The now-archived site has photographs of the bomb damage in Naples.
Octavien de Saint-Gelais; André de La Vigne, Le vergier d'honneur, nouvellement imprimé a` Paris De l'entreprise et voyage de Napples. Auquel est compris comment le roy Charles huitiesme de son nom ... passa ... depuis Lyon jusques a` Napples, ..., Paris, Jean Petit, 1500. OCLC24007635. (Some sources spell "vergier" as "vergiez".)