http://www.muslimedianews.com/2014/03/wow-muhammadiyah-ternyata-bertasawuf.htmlhttp://pustakamuhibbin.blogspot.com/2014/03/tasawuf-muhammadiyah.htmlhttps://www.facebook.com/notes/ravi-bakhtiar/tasawuf-muhammadiyah/10151215895858613 kitab tasawuf