↑ 1,00, 1,01, 1,02, 1,03, 1,04, 1,05, 1,06, 1,07, 1,08, 1,09 et 1,10 Karin Brookes, John Gattuso, Lou Harry, Edward Jardim, Donald Kraybill, Susan Lewis, Dave Nelson et Carol Turkington, Insight Guides: Philadelphia and Surroundings, Zoë Ross, 2e édition, 2005, APA Publications, (ISBN 1585730262), p. 78 - 79
