下列圖片來自也門軍事博物館: Stein, Peter. The Ancient South Arabian Minuscule Inscriptions on Wood: A New Genre of Pre-Islamic Epigraphy. Jaarbericht van het Vooraziatisch-Egyptisch
color occurrence in The Bible. Christian Symbol Wood Carvings Forty symbols at Kansas Wesleyan University Old Christian Symbols from book by Rudolf Koch (页面存档备份,存于互联网档案馆)