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{|width="700px" align="center"

*{{citation

{{citation

|initiallast = Kahn

|initiallast = Kahn

|initialfirst =Cynthia M

|initialfirst =Cynthia M

|range = Physiology Reference Guides

|range = Physiology Reference Guides

}}<br>

}}<br>

*Svendsen, E.D., Duncan, J. and Hadrill, D. (2008) ''The Professional Handbook of the Donkey'', 4th edition, Whittet Books, Appendix 1

Svendsen, E.D., Duncan, J. and Hadrill, D. (2008) ''The Professional Handbook of the Donkey'', 4th edition, Whittet Books, Appendix 1

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