J. W. Larsen, L. D. Tyrell, N. Anderson: Prevalence of breech-strike in mulesed, clipped and unmulesed Merino hoggets in south-eastern Australia. In: Australian veterinary journal. Band 90, Nummer 5, Mai 2012, S. 158–166, doi:10.1111/j.1751-0813.2012.00914.x, PMID 22510074.
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J. W. Larsen, L. D. Tyrell, N. Anderson: Prevalence of breech-strike in mulesed, clipped and unmulesed Merino hoggets in south-eastern Australia. In: Australian veterinary journal. Band 90, Nummer 5, Mai 2012, S. 158–166, doi:10.1111/j.1751-0813.2012.00914.x, PMID 22510074.