\begin{tikzpicture}
\node (fsm) at (0,0.5) {Form-Sign Mapping};
\node[draw] (fp) at (-5,0) {Form Paradigm};
\node[draw] (sp) at (5,0) {Sign Paradigm};
\node (mr) at (2,3) {Meaning Relation};
\node[draw,ellipse] (lsk) at (0,5) {Lexical Semantic Knowledge};
\node (ffm) at (-5,-2.3) {Form-Form Mapping};

\draw[->] (fp) to (sp);
\draw[->] (lsk) to (fsm);
\draw[->] (-5.1,-0.3) .. controls (-6,-0.5) and (-6,-2) .. (ffm.north) .. controls (-4,-2) and (-4,-0.5) .. (fp.south);
\end{tikzpicture}

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