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site link
http://d-nb.info/gnd/118637878
http://errol.oclc.org/laf/n95003722.html
http://onlinebooks.library.upenn.edu/webbin/ftl?at=viaf&au=90663542&library=0CHOOSE0
http://onlinebooks.library.upenn.edu/webbin/ftl?at=viaf&au=90663542
http://onlinebooks.library.upenn.edu/webbin/ftl?st=viaf&su=90663542&library=0CHOOSE0
http://onlinebooks.library.upenn.edu/webbin/ftl?st=viaf&su=90663542
http://worldcat.org/identities/lccn-no95-3722