indentation of enumitem after number to match specific format

I'm required to produce a document containing a list of items in a very specific format. To do this, I need to use the enumitem package, but I need to specify some level of indentation AFTER the item is initialized in the enumerate environment. Is there any way to add additional indentation after specifying an item? I was thinking something like changing a variable defining default indentation.

\textbf{REFERENCES}
\begin{enumerate}[labelindent=3em, leftmargin=12pt]
\item \setlength{\leftmargin}{30pt}TEST OF REFERENCE TEXT AND STUFF WHICH IS MULTI-LINE IN NATURE \setlength{\leftmargin}{12pt}
\item MORE REFERENCE TEXT
\end{enumerate}

I end up getting something very different from what I need.

I need something that has the number on the left, but the text taken at a space:

Example:

1._____Text starts here and indentation remains on next line

2._____Second item in list

with a specified spacing before the text starts and the number always aligned with the left margin. Note that I can't just insert a \hspace since the text will be multi-line in nature and would have to be applied to both lines.