Books consulted for specific information or research, such as dictionaries, encyclopedias, yearbooks, or bibliographies

A standard or object used as a baseline for measuring the position and motion of other objects; also refers more broadly to any standard used for comparison.

list of reference books; bibliography

cited material; reference literature; bibliography

material used for reference, such as books, data, or source documents

mathematical model representing the Earth's shape used as a basis for map projections and GPS coordinates in geodesy

The name of a major daily newspaper in mainland China.

provided or intended solely for use as a reference

material consulted for information, such as books or documents; bibliography

Provided for information purposes only; not to be taken as a final decision or a binding rule

restricted document available only to specific high-ranking officials in the government or party