According to GB3469-83 "Document Types and Document Carrier Codes", it is identified with one letter: m- monograph (including historical records in ancient books), c- paper, n- newspaper article, j- journal article, d- paper, r- research report, s- standard and P. The types of electronic documents are identified with two letters: d b- database and CP. The carrier types are also indicated in the reference document identification: DB/OL- online database, DB/MT- tape database, M/CD-CD-ROM book and CP/DK- disk software.
The author of a periodical. Title [J] Title, year of publication, volume (issue): page number, monograph author. Title [M]. Edition (first edition not recorded). Place of publication: publisher, year of publication, page number. Collection of authors, titles [c] and editors, collection of names, place of publication: publisher, year of publication: start and end pages. Author of the paper. Title [D] Save the location. Save unit. Year. Title of the patent document [p]. Country. Types of patent documents. Patent number. Date of publication. Standard number. Standard name. Newspaper writer. Title. Newspaper name. Publication date (version). The author of the report. Title [R]. Save the location. Year.
Shunling, the tomb of Wu Zetian's mother Yang, is located in the village, 20 kilometers northeast of Xianyang City.