, Sources The initial version is based upon the article :it:Giardini Vaticani of the Italian language edition of Wikipedia. Data concerning the measures of lengths were taken from the article :de:Vatikanische Gärten of the German language edition of Wikipedia. External links The Vatican: spirit and art of Christian Rome, a book from The Metropolitan Museum of Art Libraries (fully available online as PDF), which contains material on the gardens (pp. 155–164) Geography of Vatican City Parks in Vatican City