Let's say I have at my disposal some kind of searchable content with all the references from many books and papers. How would a source reference would be typically written/formatted? Is it dependent of the subject? If yes, how?
Some clarification: I want to know what kind of format I should expect so it would make my search for a particular reference easier.
As others have mentioned, various institutions prefer different formats. On a broader scale, a particular style is often favored by specific disciplines or groups. (For example, APA is popular in the social sciences, while CSE is used in the physical sciences.)
In general, if there are only a few sources to cite, it's done in footnotes or parenthetical citations.
For more numerous citations, an in-text marker is typically used, which references a bibliography at the end of the work.
It depends on what you are referencing, and quite importantly, where as well. There are several different systems (APA, MLA...) for quotations and references. If it is a paper you are writing, find out which of these does your university, college, institution etc. recommend or require.
If you are writing a book, it can be worth checking whether your publisher uses one specific referencing system or if you can choose one at your own leisure (or create your own).
Most of these systems have extensive guidelines (when to use a footnote, as opposed to an end note, how to format these etc.) that can be found online.
Just take a look at any book that cites references in the manner you want to study--that is, just open the book and observe how the author has done it and copy the format. Otherwise, you can purchase a style manual that will give you loads of examples and answer all your questions.
Depends how many sources we are talking about. The most standard procedure is to have an alphabetical list at the end of the book, possibly organized per chapter with letter tags or number tags for each source. These tags are then placed in the text whenever it is needed to refer to the source material.
If you don't have too many source references and it doesn't disrupt the page lay-out too much, you can place the sources in footnotes.
