Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
ekain-arquitectura.com/wordpress/?p=628
https://www.disenoyarquitectura.net/2008/11/edificio-psfs-1929-howe-lescaze.html
https://en.wikipedia.org/wiki/PSFS_Building
https://i.pinimg.com/originals/65/5b/66/655b66756e324d3f4aec3b384f840dd4.jpg
https://www.arquine.com/psfs/
https://phillyskyline.com/bldgs/psfs/psfs_33rdfl_skyline.jpg
https://www.pinterest.com/pin/136796907418042650/
https://www.phillyhistory.org/blog/index.php/2013/06/psfs-modernism-remaking-the-workaday-world/
https://www.google.com/maps/place/Loews+Philadelphia+Hotel/@39.951372,-75.1599869,3a,75y,90t/data=!3m8!1e2!3m6!1sAF1QipN-zB1N0gpZd7tNaO1CbUzabKWH89D62kQo6cdD!2e10!3e12!6shttps:%2F%2Flh5.googleusercontent.com%2Fp%2FAF1QipN-zB1N0gpZd7tNaO1CbUzabKWH89D62kQo6cdD%3Dw253-h86-k-no!7i3000!8i1019!4m8!3m7!1s0x89c6c6292d6eb3e9:0x3aa2530ffaa3d3db!5m2!4m1!1i2!8m2!3d39.951412!4d-75.160334
https://i.pinimg.com/474x/21/59/40/2159407cb0eb0e82da892ee6145ece11--philadelphia.jpg
https://www.pinterest.com/pin/93027548538947347/
https://www.philadelphiabuildings.org/pab/app/ho_display.cfm/932977
https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.pinterest.com%2Fpin%2F529243393680710987%2F&psig=AOvVaw0kGae4A50RZ0nCyR49fWwb&ust=1591643032164000&source=images&cd=vfe&ved=0CAYQtaYDahcKEwjA3PPfsvDpAhUAAAAAHQAAAAAQGQ
https://www.philadelphiabuildings.org/pab/app/ho_display.cfm/79507
https://en.wikipedia.org/wiki/PSFS_Building#/media/File:PSFSfacade.jpg
https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.phillyhistory.org%2Fblog%2Findex.php%2F2013%2F06%2Fpsfs-modernism-remaking-the-workaday-world%2F&psig=AOvVaw0kGae4A50RZ0nCyR49fWwb&ust=1591643032164000&source=images&cd=vfe&ved=2ahUKEwiG9cy9svDpAhVKyxQKHQ-uCYkQr4kDegUIARDeAQ
https://en.wikipedia.org/wiki/PSFS_Building#/media/File:PSFSboardroom.jpg
https://misfitsarchitecture.com/2017/05/21/simplicity-and-consistency-in-architecture/fcsarch-37-psfs-building-11-728-2/
https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.pinterest.ch%2Fpin%2F595601119447045154%2F&psig=AOvVaw0kGae4A50RZ0nCyR49fWwb&ust=1591643032164000&source=images&cd=vfe&ved=2ahUKEwiG9cy9svDpAhVKyxQKHQ-uCYkQr4kDegUIARCXAQ
https://www.pinterest.de/pin/64035625937228317/
https://en.wikipedia.org/wiki/PSFS_Building#/media/File:PSFS_top.jpg
https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.pinterest.cl%2Fpin%2F791507703245218406%2F&psig=AOvVaw1wLCeW-cYGGb1sVXMnv3xa&ust=1591642947617000&source=images&cd=vfe&ved=2ahUKEwizyaSVsvDpAhVL1-AKHZmPDwwQr4kDegUIARCbAQ
https://en.wikipedia.org/wiki/PSFS_Building#/media/File:PSFS12thstreet.jpg
https://libwww.freelibrary.org/digital/item/44277
https://www.google.com/maps/place/Loews+Philadelphia+Hotel/@39.951372,-75.1599869,3a,75y,90t/data=!3m11!1e2!3m9!1sAF1QipPJbtFTyIfzZHNfNXZpiqjcTXhk4PdrzOjmzp4r!2e10!3e12!6shttps:%2F%2Flh5.googleusercontent.com%2Fp%2FAF1QipPJbtFTyIfzZHNfNXZpiqjcTXhk4PdrzOjmzp4r%3Dw203-h281-k-no!7i3743!8i5193!9m2!1b1!2i22!4m8!3m7!1s0x89c6c6292d6eb3e9:0x3aa2530ffaa3d3db!5m2!4m1!1i2!8m2!3d39.951412!4d-75.160334
http://explorepahistory.com/displayimage.php?imgId=1-2-1340
CURTIS William. J. La arquitectura moderna desde 1900. Edit. Phaidon. Hong Kong, 2006. 3ª edición en español. 1ª edición 1986 (edición original 1982)
KHAN Hasan-Uddin. El estilo internacional, arquitectura moderna desde 1925 hasta 1965. Taschen, Italia, 2001.
https://www.oyster.com/es/philadelphia/hotels/loews-philadelphia-hotel/
https://www.pinterest.es/pin/7810999332310241/