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American Institute of Architects. (January 31, 2020). Architecture Billings Index in the U.S. between December 2018 to December 2019, by region [Graph]. In Statista. Retrieved April 20, 2021, from https://www.statista.com/statistics/613912/three-month-average-architecture-billings-index-in-the-us-by-region/
American Institute of Architects. "Architecture Billings Index in the U.S. between December 2018 to December 2019, by region." Chart. January 31, 2020. Statista. Accessed April 20, 2021. https://www.statista.com/statistics/613912/three-month-average-architecture-billings-index-in-the-us-by-region/
American Institute of Architects. (2020). Architecture Billings Index in the U.S. between December 2018 to December 2019, by region. Statista. Statista Inc.. Accessed: April 20, 2021. https://www.statista.com/statistics/613912/three-month-average-architecture-billings-index-in-the-us-by-region/
American Institute of Architects. "Architecture Billings Index in The U.S. between December 2018 to December 2019, by Region." Statista, Statista Inc., 31 Jan 2020, https://www.statista.com/statistics/613912/three-month-average-architecture-billings-index-in-the-us-by-region/
American Institute of Architects, Architecture Billings Index in the U.S. between December 2018 to December 2019, by region Statista, https://www.statista.com/statistics/613912/three-month-average-architecture-billings-index-in-the-us-by-region/ (last visited April 20, 2021)
