1. Sheep: breeds and management. Creator: Wrightson, John, 1840-1916. Collection: Core Historical Literature of Agriculture Publisher: Vinton, Publication Place: London : Date: 1913 Format: Book
2. Sheep-farming in North America Creator: Craig, John Alexander, d. 1910. Collection: Core Historical Literature of Agriculture Publisher: Macmillan, Publication Place: New York : Date: 1913 Format: Book