1. Egg recognition in the Herring Gull;Baerends;Proc. 14 Int. Congr. Psychol.,1955
2. The influence of central nervous mechanisms on the reaction to sensory stimuli;Baerends;Arch. Néerl. Zool.,1956
3. The ethological concept “releasing mechanism” illustrated by a study of the stimuli eliciting egg-retrieving in the Herring Gull;Baerends;Anat. Rec.,1957
4. Observations on the behaviour of the Black Tern, Chlidonias n. niger (L.), in the breeding area;Baggerman;Ardea,1956
5. Physiology of the temperature of birds;Baldwin;Sci. Publ. Cleveland Mus. Nat. Hist.,1932