Schüz, Ernst Vogelwarte Radolfzell, Radolfzell, Max Planck Institut für Ornithologie, Max Planck Society;
Schüz, E. (1969). The riddle of the so-called "Benin Ibis" and the artificial wattled birds. Ostrich, 40(Suppl. 1), 15-32. doi:10.1080/00306525.1969.9639102.