Mayr G., Alvarenga H., Mourer-Chauviré C. (2011). "Out of Africa: Fossils shed light on the origin of the hoatzin, an iconic Neotropic bird". Naturwissenschaften98 (11): 961–6. doi:10.1007/s00114-011-0849-1. பப்மெட்:21964974.
Gerald Mayr and Vanesa L. De Pietri (2014). "Earliest and first Northern Hemispheric hoatzin fossils substantiate Old World origin of a "Neotropic endemic"". Naturwissenschaften101 (2): 143–148. doi:10.1007/s00114-014-1144-8. பப்மெட்:24441712.
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Mayr G., Alvarenga H., Mourer-Chauviré C. (2011). "Out of Africa: Fossils shed light on the origin of the hoatzin, an iconic Neotropic bird". Naturwissenschaften98 (11): 961–6. doi:10.1007/s00114-011-0849-1. பப்மெட்:21964974.
Gerald Mayr and Vanesa L. De Pietri (2014). "Earliest and first Northern Hemispheric hoatzin fossils substantiate Old World origin of a "Neotropic endemic"". Naturwissenschaften101 (2): 143–148. doi:10.1007/s00114-014-1144-8. பப்மெட்:24441712.