/ˈsɛkənˌdɛri ˈrɛfərəns/ – Phrase
Definition: viện dẫn thêm, viện dẫn bổ sung.
A more thorough explanation: A secondary reference is a source of information that refers to or discusses another source of information, rather than being the original or primary source itself.
Example: In the legal field, a secondary reference may be used to support an argument or point made in a legal brief.