Dyfyniad APA

National Council for Preservation Education (U.S.). Preservation education & research. National Council for Preservation Education.

Dyfyniad Arddull Chicago

National Council for Preservation Education (U.S.). Preservation Education & Research. College Station, TX: National Council for Preservation Education.

Dyfyniad MLA

National Council for Preservation Education (U.S.). Preservation Education & Research. National Council for Preservation Education.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.