Rujukan Kitaran urea

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  2. Tymoczko, John L.; Berg, Jeremy M.; Stryer, Lubert (2013). BIOCHEMISTRY A Short Course. W.H. Freeman and Company, New York. m/s. 529. ISBN 978-1-4292-8360-1.
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  7. Kaplan Medical USMLE Step 1 Biochemistry and Medical Genetics Lecture Notes 2010, page 261
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