\documentclass{article}
\usepackage[x11names, rgb]{xcolor}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{snakes,arrows,shapes}
\usepackage{amsmath}
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\begin{document}
\pagestyle{empty}
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%
%

\enlargethispage{100cm}
% Start of code
% \begin{tikzpicture}[anchor=mid,>=latex',join=bevel,]
\begin{tikzpicture}[>=latex',join=bevel,]
  \pgfsetlinewidth{1bp}
%
\pgfsetcolor{black}
  % Edge: hello -> world
  \draw [->] (23bp,58bp) .. controls (23bp,51bp) and (23bp,41bp)  .. (23bp,22bp);
  % Node: hello
\begin{scope}
  \pgfsetstrokecolor{black}
  \draw (23bp,69bp) ellipse (21bp and 11bp);
  \draw (23bp,69bp) node {hello};
\end{scope}
  % Node: world
\begin{scope}
  \pgfsetstrokecolor{black}
  \draw (23bp,11bp) ellipse (23bp and 11bp);
  \draw (23bp,11bp) node {world};
\end{scope}
%
\end{tikzpicture}
% End of code

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\end{document}
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