http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Kho tàng ca dao người Việt; T4: Tra cứu
Tập Tra cứu theo chủ đề và thi pháp ca dao + những bài phân tích tiêu biểu của những nhà chuyên khảo về ca dao