Williams, G. (1966). A study of a seminal defect in Hereford bulls and also of the effect on fertility of the movement of cattle to a new environment. University of London.
Lua i Stíl Chicago (17ú heag.)Williams, Gareth. A Study of a Seminal Defect in Hereford Bulls and Also of the Effect on Fertility of the Movement of Cattle to a New Environment. University of London, 1966.
Lua MLA (8ú heag.)Williams, Gareth. A Study of a Seminal Defect in Hereford Bulls and Also of the Effect on Fertility of the Movement of Cattle to a New Environment. University of London, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.