Extensions are optional, if you put them note that the bibtex command takes the AUX file as input. Some field types can optionally be used with any entry type:. However, it is fairly straight-forward. This is a common theme in LaTeX in general, where it tries as much as possible to keep content and presentation separate. The addition of BibTeX adds extra complexity for the processing of the source to the desired output. As we said before, biblatex is widely considered the 'successor' of BibTeX.
You need to type it as you want it to be presented.
using bibtex: a short guide
To use BibTeX, here's what you need to do. For example, Google Scholar offers the option to return properly formatted output, which can also be turned on in the settings page. Using curly braces around single letters is also to be avoided if possible, as it may mess up the kerning, especially with biblatex,  so the first step should generally be to enclose single words in braces. The most commonly-used are probably articlebookincollection for a chapter in an edited volumeinproceedings for an article in conference proceedingstechreport for a report, like a "Working paper" or "Technical report", issued by an institutionand unpublished. This is the scheme that I use in this tutorial. The second command is the one that actually specifies the.