1. Territory in bird life;Alexander;Brit. Birds,1921
2. A study of the breeding biology of the Purple Martin (Progne subis.) Amer;Allen;Midi. Nat.,1953
3. Contribution to the biology of the Ruff (Philomachus pugnax.) Dansk;Andersen;Orn. Foren. Tidskr.,1951
4. Territorial behaviour of the Yellowhammer Emberiza citrinella and Corn Bunting E;Andrew;calandra. Ibis calandra. Ibis,1956