Document number: according to the types of reference materials, it can be divided into monograph [M], conference proceedings [C], newspaper articles [N], periodical articles [J], dissertations [D], reports [R], standards [S], patents [P], precipitation documents [A] and magazines [G].

Graduation thesis writing should be based on a rigorous and realistic scientific attitude, where others' achievements are cited. References should list the main references directly cited in the order in which they appear in the text.