"National Register of Historic Places: Multnomah County, Oregon, pg. 9". nationalregisterofhistoricplaces.com [private]. Retrieved July 28, 2007. http://www.nationalregisterofhistoricplaces.com/OR/Multnomah/state9.html
"Oregon National Register List" (PDF). Oregon Parks and Recreation Department. June 6, 2011. p. 40. Archived from the original (PDF) on April 25, 2018. Retrieved August 6, 2023. https://web.archive.org/web/20180425031913/https://www.oregon.gov/OPRD/HCD/NATREG/docs/oregon_nr_list.pdf
King, Bart: An Architectural Guidebook to Portland, pg. 145. Gibbs Smith, 2001
Multnomah County Assessor. Assessor Information on PortlandMaps.com http://portlandmaps.com/detail.cfm?action=Assessor&propertyid=R246075&state_id=1N1E34CD%20%207800&address_id=101163&intersection_id=&dynamic_point=0&x=7644681.12&y=683138.941&place=319%20SW%20WASHINGTON%20ST&city=PORTLAND&neighborhood=DOWNTOWN&seg_id=138606
"Emporis: Spalding Building". Archived from the original on February 6, 2007. Retrieved July 28, 2007. https://web.archive.org/web/20070206193437/http://www.emporis.com/en/wm/bu/?id=spaldingbuilding-portland-or-usa
Rogoway, Mike (August 24, 2016) [online date August 22]. "Rounded individuals fit easily into this Squarespace". The Oregonian. pp. B13, B15. Retrieved August 27, 2016. http://www.oregonlive.com/silicon-forest/index.ssf/2016/08/squarespace_ceo_anthony_casale.html