"Plaza Hotel", undated, by Carolyn Pitts(PDF). National Register of Historic Places Inventory-Nomination. National Park Service. undated [2009-07-17]. (原始内容存档(PDF)于2011-05-27).请检查|date=中的日期值 (帮助)
广场饭店(Plaza Hotel). National Historic Landmark summary listing. National Park Service. 2007-09-18. (原始内容存档于2007-10-16).
"Plaza Hotel", undated, by Carolyn Pitts(PDF). National Register of Historic Places Inventory-Nomination. National Park Service. undated [2009-07-17]. (原始内容存档(PDF)于2011-05-27).请检查|date=中的日期值 (帮助)