Sheldon, M., Dobson, H., Smith, R., Royal, M., Knight, C., & Sheldon, I. (2007). The High-producing Dairy Cow and its Reproductive Performance. Reproduction in Domestic Animals, 42(s2), pp. 17-23. doi:10.1111/j.1439-0531.2007.00906.x

Sheldon, Martin, H. Dobson, RF Smith, MD Royal, CH Knight, and IM Sheldon. "The High-producing Dairy Cow and Its Reproductive Performance." Reproduction in Domestic Animals 42, no. s2 (2007): 17-23.

Sheldon, Martin, et al. "The High-producing Dairy Cow and Its Reproductive Performance." Reproduction in Domestic Animals 42.s2 (2007): 17-23.