Butler, D., & Butler, J. (2004). The principles of horseshoeing (P3): The ultimate textbook of farrier science and craftsmanship for the 21st century (Ultimate enlarged edition.). Doug Butler Enterprises, Inc..
Chicago Style (17th ed.) CitationButler, Doug, and Jacob Butler. The Principles of Horseshoeing (P3): The Ultimate Textbook of Farrier Science and Craftsmanship for the 21st Century. Ultimate enlarged edition. Crawford, Neb.: Doug Butler Enterprises, Inc., 2004.
MLA (9th ed.) CitationButler, Doug, and Jacob Butler. The Principles of Horseshoeing (P3): The Ultimate Textbook of Farrier Science and Craftsmanship for the 21st Century. Ultimate enlarged edition. Doug Butler Enterprises, Inc., 2004.
Warning: These citations may not always be 100% accurate.