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APA Citation
Wen, J., Helmbrecht, A., Elliot, M. A., Thomson, J., & Persia, M. E. (n.d.). evaluation of the tryptophan requirement of small-framed first cycle laying hens. Poultry science, 98, 1263–1271. http://access.bl.uk/ark:/81055/vdc_100094058986.0x000057