APA (7th ed.) Citation

Koch Rudolf. (1955). The book of signs: 493 symbols used from earliest times to the middle ages by primitive peoples and early christians. Dover publications.

Chicago Style (17th ed.) Citation

Koch Rudolf. The Book of Signs: 493 Symbols Used from Earliest Times to the Middle Ages by Primitive Peoples and Early Christians. New york: Dover publications, 1955.

MLA (9th ed.) Citation

Koch Rudolf. The Book of Signs: 493 Symbols Used from Earliest Times to the Middle Ages by Primitive Peoples and Early Christians. Dover publications, 1955.