1. Recent developments in poultry husbandry;Blount;British Poultry and World Poultry Digest,1954
2. Poultry lighting for egg production;Dobie;Washington Exp. Sta. Bul.,1946
3. The use of artificial light to increase winter egg production;Dougherty;California Agr. Exp. Sta. Cir.,1922
4. Artificial lighting of laying hens;Eramus;Farming in South Africa,1955
5. The role of darkness and light in the photoperiodic response of the testes of white-crowned sparrow;Farner;Biol. Bul.,1953