1. Effect of varying day-length on time of oviposition in domestic fowl;Biellier,1960
2. Clutch length in relation to period of illumination in the domestic fowl;Byerly;Poultry Sci.,1951
3. Statistical Methods;Snedecor,1965
4. Influencia de los periodos de iluminacion sobre la postura en ciclos en la galina domestica;Van Albada,1958