8Astherr S; Freyer D. Asian Turtles are Threatened by Extinction [ J ]. Turtle and Tortoise Newsletter, 2000, ( 1 ) :7 - 11.
9Lofts B, Tsui H W. Histological and Histochemical Changes in the Gonads and Epididymides of the Male Soft - shelled Turtle Trionyxsinensis[J]. J. Zool. , (Lond.) ,1997, 181:57-68.
