Where can I find the standard LaTeX reference manual?

Like a semi-detailed user manual for LaTeX commands (`\newtheorem`, etc).

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Have a look at the answers given here: tex.stackexchange.com/q/11/14 . You might find something helpful. –  Vivi Mar 14 '12 at 8:17

`texdoc latex2e` at the command prompt will lead directly to the pdf of LaTeX reference manual both in miktex and texlive distro –  texenthusiast Nov 29 '12 at 7:36