\documentclass[12pt]{article}

\usepackage{pst-node}
\usepackage{pstricks-add}

\begin{document}

\[
\begin{psmatrix}
E&W_i(X)&&Y\\
&&W_j(X)
\psset{arrows=->,nodesep=3pt,linewidth=5pt}
\everypsbox{\scriptstyle}
\ncline[linecolor=red,arrows=H->,hooklength=5mm,hookwidth=4mm]{1,1}{1,2}       
%% This should be \hookrightarrow
\ncline{1,2}{1,4}^{\tilde{t}}
\ncline{1,2}{2,3}<{W_{ij}}
\ncline{2,3}{1,4}>{\tilde{s}}
\end{psmatrix}
\]

\[
\begin{psmatrix}
&&C(K)\\
&M_i&&M_j\\
W_i(K)&&&&W_j(K)
\psset{arrows=->,nodesep=3pt}
\everypsbox{\scriptstyle}
\ncline[arrows=->>]{1,3}{2,2}
\ncline[arrows=->>]{1,3}{2,4}
\ncline[arrows=<<-,linestyle=dashed]{2,2}{2,4}_{m_{ij}}
\ncline[linecolor=red,arrows=H->,hooklength=5mm,hookwidth=-2mm]{2,2}{3,1}<{m_i}  
%% \hookrightarrow with the
%% "litle tail" directed to the left; the same for the next arrow.
\ncline{2,4}{3,5}>{m_j}
\ncline{3,5}{3,1}_{W_{ji}}
\end{psmatrix}
\]
\end{document}


