الإتاحة: http://hdl.handle.net/20.500.12613/2857Test
الإتاحة: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667982Test
الإتاحة: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555937Test
الإتاحة: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.563285Test
الإتاحة: http://hdl.handle.net/10092/1786Test
الإتاحة: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272397Test
الإتاحة: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.673508Test
الإتاحة: https://scholarworks.umass.edu/dissertations/AAI9329606Test