What is the difference between reftex-citation and org-reftex-citation?
And where can I find the documentation for org-reftex-citation referenced in this answer?
What is the difference between reftex-citation and org-reftex-citation?
And where can I find the documentation for org-reftex-citation referenced in this answer?
You can find the documentation for org-reftex-citation by doing:
C-h f org-reftex-citation RET
In fact, you can use C-h f (describe-function) to look up documentation for any command or function that is available in your Emacs installation.
As for the difference between reftex-citation and org-reftex-citation: The former allows you to quickly insert citations into LaTeX documents, while the latter enables you to do the same for org-mode files. They are related in the sense that after identifying the correct .bib file to use for the current file, org-reftex-citation calls reftex-citation to insert a citation at point.
In addition to describe-function there are a number of commands that you can use to ask Emacs about itself. Some of the most useful ones are:
describe-variable (C-h v)describe-key (C-h k)describe-key-briefly (C-h c)describe-mode (C-h m)describe-package (C-h P)