1\documentclass{minimal}
2
3% Tikz
4\usepackage{pgf}
5\usepackage{tikz}
6
7\begin{document}
8
9\begin{center}
10 \begin{tikzpicture}
11 [
12 	vertex/.style={draw=none,circle,fill=black,minimum size=2pt},
13	oedge/.style={->,>=latex,shorten >=6pt,draw,black,thick},
14	roedge/.style={->,>=latex,shorten >=6pt,draw,black,thick,color=red}
15 ]
16
17\coordinate (V1) at (-3,3);
18\coordinate (V2) at (0,0);
19\coordinate (V3) at (0,6);
20\coordinate (V4) at (3,3);
21
22\path[oedge] ([yshift=3pt]V1) to ([yshift=3pt]V2) {};
23\path[roedge] ([yshift=-3pt]V2) to ([yshift=-3pt]V1) {};
24
25\path[roedge] ([yshift=3pt]V1) -- ([yshift=3pt]V3) {};
26\path[oedge] ([yshift=-3pt]V3) -- ([yshift=-3pt]V1) {};
27
28\path[oedge] ([xshift=2pt]V3) -- ([xshift=2pt]V2) {};
29\path[oedge] ([xshift=-2pt]V2) -- ([xshift=-2pt]V3) {};
30
31\path[oedge] ([yshift=3pt]V2) -- ([yshift=3pt]V4) {};
32\path[roedge] ([yshift=-3pt]V4) -- ([yshift=-3pt]V2) {};
33
34\path[roedge] ([yshift=3pt]V3) -- ([yshift=3pt]V4) {};
35\path[oedge] ([yshift=-3pt]V4) -- ([yshift=-3pt]V3) {};
36
37\node[vertex] at (V1) {};
38\node[vertex] at (V2) {};
39\node[vertex] at (V3) {};
40\node[vertex] at (V4) {};
41
42\draw[<-,>= latex,thick] (3.3,3) arc (0:320:94pt);
43
44
45\end{tikzpicture}
46\end{center}
47
48\end{document}
49