Nördlicher Gelbwangengibbon (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "Nördlicher Gelbwangengibbon" in German language version.

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V. A. Melfi: Ex situ gibbon conservation: status, management and birth sex ratios. In: International Zoo Yearbook 46, Nr. 1, 2012, S. 241–251, doi:10.1111/j.1748-1090.2011.00150.x.
Lee E. Harding: Nomascus leucogenys (Primates: Hylobatidae). In: Mammalian Species 44, Nr. 1, 2012, S. 1–15, doi:10.1644/890.1.

Van Ngoc Thinh, Alan R. Mootnick, Vu Ngoc Thanh, Tilo Nadler, Christian Roos: A new species of crested gibbon, from the central Annamite mountain range. (PDF) In: Vietnamese Journal of Primatology. 1, Nr. 4, 2010, S. 1–12.