1. "Risâle-yi Yiğitbaşı fi't-tasavvuf : manuscriptundated""Mukaddime fi't-tasavvuf""Risâle-yi Yiğitbaşı fi't-tasavvuf"'Mukaddime' Creator: Yiğitbaşı Velî Language: Turkish, Ottoman (1500-1928) Geographic region: No place, unknown, or undetermined