1. ANONYMOUS(1995) Rapeseed – Determination of glucosinolates content – Part 1: method using high performance liquid chromatography. EN ISO 9167-1: German version
2. BRYDEN, W.L., Li, X., RAVINDRAN, G., HEW, L.I. & RAVINDRAN, V. (2009) Ileal digestible amino acid values in feedstuffs for poultry. Rural Industries Research and Development Corporation Publication No 09/071, Barton, ACT, Australia
3. The mechanism for the conversions of uric acid into allantoin and glycine
4. Estimates of individual factors of the tryptophan requirement based on protein and tryptophan accretion responses to increasing tryptophan supply in broiler chickens 8 – 21 days of age
5. GESELLSCHAFTfÜRERNÄHRUNGSPHYSIOLOGIE(1999)Empfehlungen zur Energie- und Nährstoffversorgung der Legehennen und Masthühner (Broiler)(Frankfurt am Main, Germany, DLG-Verlag)