|"Birds in Beinecke MS 189"|
|Hugh Feiss, Ronald E. Pepin|
|Yale University Library Gazette, 68:3-4, 1994, 110-115|
Argues that 12c. people were starting to look upon nature in a new way. A copy of Hugh de Fouilloy's Aviarum (MS. New Haven, Yale University Beinecke Library, Marston MS 189) contains illustrations of birds drawn by someone who knew them from personal observation.