| operaam.org | OPERA America: The Service Organization for Opera |
| ncshpo.org | National Conference of State Historic Preservation Officers (NCSHPO) |
| nps.gov | National Center for Preservation Technology and Training |
| adobe.com | Adobe Acrobat Reader |
| usitt.org | United States Institute For Theatre Technology |
| tcg.org | Theatre Communications Group |
| nps.gov | Heritage Preservation Services |
| iti-worldwide.org | International Theatre Institute |
| nthp.org | National Trust for Historic Preservation |
| nationaltrust.org | National Trust for Historic Preservation |
United States , Texas , San Antonio