According to GB3469-83 "Document Types and Document Carrier Codes", the types of references and document types are indicated by English single letters, and the retrieval tools are indicated by W, so dictionaries belong to references.
Specific format:
[1] Shuxin Town. The second sea [W]. Shanghai: Shanghai Dictionary Publishing House, 1999.
[2] Xie Guanghui. Interpretation of Chinese etymology dictionary [W].2000.8.
[3] Hong Chao. Encyclopedia of middle school students' culture. Middle school bookstore, 193 1.
Extended data:
According to GB3469-83 "File Types and File Carrier Codes", reference file types and file types are identified by a single letter:
Monograph M, newspaper N, periodical J, patent document P, compilation G, ancient book O, technical standard S, dissertation D, scientific report R, reference tool K, retrieval tool W, file B and audio tape A.
Chart Q, record L, product sample X, video tape V, meeting record C, Chinese translation T, music score I, film Y, manuscript H, microfilm U, slide Z, microfilm F, other E.
References:
Baidu Encyclopedia-References