Source:Meyer
From Pittsburgh Streets
Basil Meyer. The William Warren Card Mansion: 7110–7116 Penn Avenue, Pittsburgh, Pa., 15208: 1893 to 1977. Unity Center, Pittsburgh, 1977. Included with the Individual Property Historic Nomination Form for the Card Lane Carriage House, Historic Review Commission, Division of Development Administration and Review, Department of City Planning, City of Pittsburgh, https://apps.pittsburghpa.gov/dcp/Card_Carriage_House_Combined_Nomination.pdf.
