↑ Peptide Hormone Secretion/Peptide Hormone Action: A Practical Approach, K. Siddle, J. C. Hutton, Oxford University Press, 1991, ISBN 0-19-963073-9. ↑ Peptide Hormone Secretion: A Practical Approach, J. C. Hutton, Hull University Press, 1991, ISBN 0-19-963068-2. ↑ The Practice of Medicinal Chemistry, C. G. Wermuth, Academic Press, 2003, ISBN 0-12-744481-5. ↑ The Endocrine System in Sports and Exercise, William J. Kraemer, Alan D. Rogol, Blackwell Publishing, 2005, ISBN 1-4051-3017-2. ↑ Dictionary of Biological Psychology, Philip Winn, Taylor and Francis, 2001, ISBN 0-415-13606-7. ↑ McGraw-Hill Encyclopedia of Science & Technology, Sybil P. Parker, McGraw-Hill, 1997, ISBN 0-07-911504-7.