1. Bigham, M. L., Meyer, H. H. and Smeaton, J. The heritability of loose wool bulk and colour traits and the genetic and phenotypic correlations with other wool traits. Proceedings of the New Zealand Society of Animal Production. Vol. 43, pp.83–86.
2. Seasonal wool production of Romney, Coopworth, Perendale, Cheviot, and Corriedale wethers
3. Carnaby, G. A. and Elliott, K. H. Bulk: a wool trait of importance to the carpet industry. Proceedings of the New Zealand Society of Animal Production. Vol. 40, pp.196–204.