Graph 用乳胶绘制有向图

我想画一个箭头，从A指向B，C，D。，如图所示。我用乳胶怎么做

到目前为止，我已经：

\begin{tikzpicture}
\node[circle,draw](z){$A$}
  child{node[circle,draw]{B}} 
  child{node[circle,draw]{C}}
  child{node[circle,draw]{D}}
  child{node[circle,draw]{E}}
  child{node[circle,draw]{F}}
  child{node[circle,draw]{G}};
\end{tikzpicture}

nvm，我明白了

\begin{tikzpicture}[edge from parent/.style={draw,-latex}]
\node[circle,draw](z){$A$}
  child{node[circle,draw]{B}} 
  child{node[circle,draw]{C}}
  child{node[circle,draw]{D}}
  child{node[circle,draw]{E}}
  child{node[circle,draw]{F}}
  child{node[circle,draw]{G}};
\end{tikzpicture}