Παραπομπή APA

(1973). National Trust for Historic Preservation: Annual report 1972-1973. Washington, D.C.: [National Trust for Historic Preservation.

Παραπομπή Chicago Style

National Trust for Historic Preservation: Annual Report 1972-1973. Washington, D.C.: [National Trust for Historic Preservation, 1973.

Παραπομπή MLA

National Trust for Historic Preservation: Annual Report 1972-1973. Washington, D.C.: [National Trust for Historic Preservation, 1973.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.