Citing text tutorials and practices? Supercite?

[Johnny <yggdrasil@gmx.co.uk>]

I notice several users on this list have a nice citation style to refer
to e.g. (info) locations or code snippets, such as the example below
(copied from a post to examplify what I would like to do).

,----[ C-h v gnus-thread-sort-functions RET ]
| gnus-thread-sort-functions is a variable defined in `gnus-sum.el'.
| Its value is (gnus-thread-sort-by-number
|  (not gnus-thread-sort-by-most-recent-date)
|  gnus-thread-sort-by-total-score)
`----

How does one achieve this?

I realise Supercite may be part of the solution and have been reading
the info pages, but do not see how the above would be
done. Additionally, using Supercite changes the default Gnus style when
replying to messages (e.g. 'R'), which I find quite nice and want to
keep; I guess I could customise Supercite to mimic this, but can't see
what is to gain by that?

Is Supercite commonly used for this and is there a good "style guide" for
citations around? Examples appreciated! :)

Thanks for any pointers!

-- 
Johnny