\documentclass{article}
\usepackage{tikz}
%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{10pt}%
%%%>
\usepackage[europeanresistors,americaninductors]{circuitikz}
\begin{document}
\title{Norton equivalent circuit for Y-parameters of a two-port network using controlled sources}
\author{Dalba}
\begin{circuitikz}[american voltages]
\draw[american currents]
 (0,0) to [open, v^>=$V_1$] (0,3)
 (1,0) to [R,*-*,l=$Y_{11}$] (1,3)
 (3,3) to [cI_=$Y_{12}V_{2}$] (3,0)
 (0,3) to [short, o-, i^=$I_1$] (1,3)
 to [short, *-] (3,3)
 (0,0) to [short, o-] (3,0)
 ;
\draw[dashed]
 (3,0) -- (6,0);
\draw[american currents]
 (6,3) to [cI_=$Y_{21}V_{1}$] (6,0)
 (6,0) to [short, -o] (9,0)
 (8,0) to [R,*-,l=$Y_{22}$] (8,3)
 (9,0) to [open,v_>=$V_2$] (9,3)
 (9,3) to [short, o-, i_=$I_2$] (8,3)
 to [short, *-] (6,3)
 ;
\end{circuitikz}
\end{document}