Zoelzer, F., C. Engel, D. Paul W., and B. Anna Lena. “A Comparative Study of Nightly Allonursing Behaviour in Four Zoo-Housed Groups of Giraffes (Giraffa Camelopardalis) ”. Journal of Zoo and Aquarium Research, vol. 8, no. 3, July 2020, pp. 175-80, doi:10.19227/jzar.v8i3.508.