National Council for Preservation Education (U.S.). Preservation education & research. National Council for Preservation Education.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)National Council for Preservation Education (U.S.). Preservation Education & Research. College Station, TX: National Council for Preservation Education.
MLA -ийн эшлэл (9 дэх хэвлэлт)National Council for Preservation Education (U.S.). Preservation Education & Research. National Council for Preservation Education.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.