Bell, W. E. (1875). Carpentry made easy, or, The science and art of framing on a new and improved system: With specific instructions for building balloon frames, barn frames, mill frames, warehouses, church spires, etc., comprising also a system of bridge building, bills, estimates of cost, and valuable tables (2nd ed., enl. and improved.). H. Challen.

Bell, William E. Carpentry Made Easy, or, The Science and Art of Framing on a New and Improved System: With Specific Instructions for Building Balloon Frames, Barn Frames, Mill Frames, Warehouses, Church Spires, Etc., Comprising Also a System of Bridge Building, Bills, Estimates of Cost, and Valuable Tables. 2nd ed., enl. and improved. Philadelphia: H. Challen, 1875.

Bell, William E. Carpentry Made Easy, or, The Science and Art of Framing on a New and Improved System: With Specific Instructions for Building Balloon Frames, Barn Frames, Mill Frames, Warehouses, Church Spires, Etc., Comprising Also a System of Bridge Building, Bills, Estimates of Cost, and Valuable Tables. 2nd ed., enl. and improved. H. Challen, 1875.