Green AS, Tang G, Lango J, Klasing KC, Fascetti AJ (2011). „Domestic cats convert ((2) H(8))-β-carotene to ((2) H(4))-retinol following a single oral dose”. Journal of Animal Physiology and Animal Nutrition: no. PMID21797934. doi:10.1111/j.1439-0396.2011.01196.x.
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Green AS, Tang G, Lango J, Klasing KC, Fascetti AJ (2011). „Domestic cats convert ((2) H(8))-β-carotene to ((2) H(4))-retinol following a single oral dose”. Journal of Animal Physiology and Animal Nutrition: no. PMID21797934. doi:10.1111/j.1439-0396.2011.01196.x.