National Council for Preservation Education (U.S.). Preservation education & research. National Council for Preservation Education.
Citazione stile Chigago Style (17a edizione)National Council for Preservation Education (U.S.). Preservation Education & Research. College Station, TX: National Council for Preservation Education.
Citatione MLA (9a ed.)National Council for Preservation Education (U.S.). Preservation Education & Research. National Council for Preservation Education.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.