Source: http://www.univ-bejaia.dz/jspui/bitstream/123456789/5435/1/Conception%20et%20r%C3%A9alisation%20d%E2%80%99une%20application%20mobile%20pour%20le%20service%20de%20tourisme%2C%20cas%20d%E2%80%99%C3%A9tude%20Wilaya%20de%20Bejaia.pdf