Articles on Quaker meetinghouse architecture:
Friends Meeting House Architectural Types from the Quakerpedia
http://en.quakerpedia.org/index.php?title=Category:Friends_Meeting_House_Architectural_Types
New York Landmarks Conservancy
Common Bond, Volume 12, No. 2 [American Religious Buildings, page 2]
October 1996
http://www.sacredplaces.org/PSP-InfoClearingHouse/articles/Quaker%20Meetinghouse%20Architecture.htm