In Acta XI Congressus internationalis ornithologici, Basel ... 1954. Hg. v. A. Portmann & E. Sutter. Basel, Stuttgart, 1955. (= Experientia, Suppl. 3) pp. 669–76.
In Acta XI Congressus internationalis ornithologici, Basel … 1954. Hg. v. A. Portmann & E. Sutter. Basel, Stuttgart, 1955. (= Experientia, Suppl. 3) pp. 669–76.