1. Free Library of Philadelphia, Lewis E 235b Title: Treatise on grammar Place: Istanbul Date: 1400-1450
2. Free Library of Philadelphia, Lewis T136 Title: Treatise on grammar Place: undetermined Date: 1000-1500
3. Free Library of Philadelphia, Lewis T201 Title: Treatise on grammar Place: undetermined Date: 1000-1500
4. Free Library of Philadelphia, Lewis T202 Title: Treatise on grammar Place: undetermined Date: 1000-1500