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♦ ¹del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ ²Analysing diet of small herbivores: the efficiency of DNA barcoding coupled with high-throughput pyrosequencing for deciphering the composition of complex plant mixtures, Eeva M Soininen, Alice Valentini, Eric Coissac, Christian Miquel, Ludovic Gielly, Christian Brochmann, Anne K Brysting, Jørn H Sønstebø, Rolf A Ims, Nigel G Yoccoz and Pierre Taberlet, Frontiers in Zoology 2009, 6:16