Jubb, T.F., Fordyce, G., Bolam, M.J., Hadden, D.J., Cooper, N.J., Whyte, T.R., Fitzpatrick, L.A., Hill, F., and D'Occhio, M.J. (2003) Trial introduction of the Willis dropped ovary technique for spaying cattle in northern Australia. Australian Veterinary Journal, 81 (1-2). pp. 66-70.

Fordyce, Geoffry, Jubb, Tristan F., Fitzpatrick, Lee A., Whyte, Tim. R, Cooper, Neil J., Bolam, Matt J., Haddon, David J., Hill, Felicity, and D'Occhio, Michael J. (2001) Contraceptive efficacy of an intra-uterine device in Brahman cattle. Animal Reproduction Science, 65 (3-4). pp. 193-204.