APA (7 ম সংস্করণ) উদ্ধৃতি

Koch, R. (1930). The book of signs: Which contains all manner of symbols used from the earliest times to the Middle Ages by primitive peoples and early Christians. Dover Publications.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Koch, Rudolf. The Book of Signs: Which Contains All Manner of Symbols Used from the Earliest Times to the Middle Ages by Primitive Peoples and Early Christians. Dover Publications, 1930.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

Koch, Rudolf. The Book of Signs: Which Contains All Manner of Symbols Used from the Earliest Times to the Middle Ages by Primitive Peoples and Early Christians. Dover Publications, 1930.