Oakland Zoo. "Mandarin Duck" at
http://www.oaklandzoo.org/atoz/azmanduck.html

Harrison, Colin and Alan Greensmith. Eyewitness Handbooks Birds of the
World. New York: DK, 1993

"Hoopoe" at
http://www.naturalia.org/ZOO/AN_CIELO/e_upupa.html

"Hoopoe" at
http://www.safaricamlive.com/Encyclopedia/birds/hoopoes/Hoopoe%20Info.html

"Asian Paradise-Flycatcher" at
http://www.forestry.sarawak.gov.my/forweb/wildlife/mgmt/pa/apflyc.html