Answer:
A bibliographic reference is a minimum set of data that allows the identification of a published or unpublished source or a part of it. By publishing both monographs, collective works, conference proceedings and corresponding communications, journal articles, newspaper articles, cartographic material, video, photography or musical scores, for example. The guidelines for making references are set out in the ISO 690 standard.
Appointments have several important purposes: to defend intellectual honesty (or avoid plagiarism), to attribute previous or non-original work and ideas to the correct sources to allow the reader to independently determine whether the material being referenced supports the author's argument and how he affirmed it, and to help the reader measure the strength and validity of the material the author has used.
Any appointment to another work or publication must be conveniently expressed; either at the bottom of the page, at the end of the chapter or section, or at the end of the document in question.
