[mohamedselim]

as i think you have two options :
1- convert the file whether epub or mobi to any format other than pdf that pages or any other program in mac which have printing capability can accept as rtf or so (i am not fluent in Mac) by calibre then save the converted file by calibre to disc then print.
2- extract the html of epub by naming the epub extension of file to zip then unzip then copy html files inside then open by browser then print within browser or in case of mobi files extract by the python script called MobiUnpack.pyw then MobiML2HTML.pyw (the non graphical user interface versions has same names but has extensions .py and you should install active python or the python version of mac first) or install active perl first or the perl version of mac then use script called mobi2html.exe to unpack mobi to html then open resulting html within browser then print within browser.