1. William C. Duckworth, 2. Robert G. Bennett and 3. Frederick G. Hamel: Insulin Degradation: Progress and Potential (html) (koko artikkeli html muodossa) Endocrine reviews vol. 19 no. 5 608–624. October 1, 1998. # The Endocrine Society. Arkistoitu 12.6.2013. Viitattu 19.5.2011. (englanniksi)
1. William C. Duckworth, 2. Robert G. Bennett and 3. Frederick G. Hamel: Insulin Degradation: Progress and Potential (html) (koko artikkeli html muodossa) Endocrine reviews vol. 19 no. 5 608–624. October 1, 1998. # The Endocrine Society. Arkistoitu 12.6.2013. Viitattu 19.5.2011. (englanniksi)