Παραπομπή APA

(1973). Documenting a legacy: 40 years of the Historic American Buildings Survey. [s.l.]: [s.n.].

Παραπομπή Chicago Style

Documenting a Legacy: 40 Years of the Historic American Buildings Survey. [s.l.]: [s.n.], 1973.

Παραπομπή MLA

Documenting a Legacy: 40 Years of the Historic American Buildings Survey. [s.l.]: [s.n.], 1973.

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