1 2 Fang I. E. Alphabet to Internet: Mediated Communication in Our Lives. — Rada Press, 2007. — ISBN 978-1933011905. ↑ Snyder, Noel F. R., Helen Snyder. Raptors of North America: Natural History and Conservation. — Voyageur Press, 2006. — P. 40. — ISBN 0-7603-2582-0. ↑ 1986: Coal mine canaries made redundant, BBC News (30 декабря 1986). ↑ (August 1914) «Man And His Machines: Resuscitation Cage For Mine Canarie».