@book {HeyF1978,
author    = "Hey, Wilhelm and Speckter, Otto",
edition   = "Nachdr. [einer sp{\"a}teren Ausg.] Hamburg, Perthes, [o.J.]",
publisher = "Harenberg",
address   = "Dortmund",
title     = "F{\"u}nfzig Fabeln f{\"u}r Kinder",
year      = "1978",
url       = "http://www.uni-frankfurt.de/fb/fb10/jubufo/DigBib_-_publ_ac/Epo/rombie/Wilhelm_Hey___Otto_Speckter_-_Funfzig_Fabeln_f__r_Kinder.pdf"}