

\documentclass[12pt,oneside,a4paper]{article}

\usepackage[british]{babel}
\usepackage{graphicx}
\usepackage{array}			% for begin{tabular} with >{\centering\arraybackslash ...

\begin{document}

	\begin{tabular}{l|c|c|c|c}
	            & \multicolumn{4}{c}{{\bfseries Research Institutes}} \\
		\cline{2-5}                          
								   & Eawag  &  Empa  &   PSI  &   WSL   \\
		\hline
		Journal Article            & 11278  & 14407  & 31141  & 11543   \\
		Newspaper/Magazine Article &  1245  &  1238  &    34  &  3387   \\
		(Edited) Book              &   282  &   404  &    44  &   920   \\
		Book Chapter               &   739  &   742  &   458  &  2820   \\
		Proceedings Paper          &  1095  &  4613  &  4113  &  2370   \\
	\end{tabular}

	~\\ ~\\

	\begin{tabular}{l|c|c|c|c}
	            & \multicolumn{4}{c}{{\bfseries Research Institutes}} \\
	    \cline{2-5}                          
	            &  \includegraphics[height=2em]{logo/eawag}
	            &  \includegraphics[height=2em]{logo/empa}
	            &  \includegraphics[height=2em]{logo/psi}
	            &  \includegraphics[height=2em]{logo/wsl}		\\
		\hline
		Journal Article            & 11278  & 14407  & 31141  & 11543   \\
		Newspaper/Magazine Article &  1245  &  1238  &    34  &  3387   \\
		(Edited) Book              &   282  &   404  &    44  &   920   \\
		Book Chapter               &   739  &   742  &   458  &  2820   \\
		Proceedings Paper          &  1095  &  4613  &  4113  &  2370   \\
	\end{tabular}

	~\\ ~\\

	\begin{tabular}{ l
		|>{\centering\arraybackslash}p{8ex}
		|>{\centering\arraybackslash}p{8ex}
		|>{\centering\arraybackslash}p{8ex}
		|>{\centering\arraybackslash}p{8ex}		} % uses 'array' package!
	            & \multicolumn{4}{c}{{\bfseries Research Institutes}} \\
	    \cline{2-5}                          
	            &  \includegraphics[height=2em]{logo/eawag}
	            &  \includegraphics[height=2em]{logo/empa}
	            &  \includegraphics[height=2em]{logo/psi}
	            &  \includegraphics[height=2em]{logo/wsl}		\\
		\hline
		Journal Article            & 11278  & 14407  & 31141  & 11543   \\
		Newspaper/Magazine Article &  1245  &  1238  &    34  &  3387   \\
		(Edited) Book              &   282  &   404  &    44  &   920   \\
		Book Chapter               &   739  &   742  &   458  &  2820   \\
		Proceedings Paper          &  1095  &  4613  &  4113  &  2370   \\
	\end{tabular}


\end{document}