Clearview(英语:Clearview (typeface)) Loutzenheiser, D.W. Design of Signs for the Pentagon road network. Proceedings of the Highway Research Board. 1943: 206–35
埃塞俄比亚 哥斯达黎加、萨尔瓦多、危地马拉、洪都拉斯、墨西哥、尼加拉瓜、巴拿马 减速让行 道路交通标志 Vienna Convention on RoadSigns and Signals. United Nations Publication. 1968. ISBN 978-92-1-116973-7
Collection of Stop and Yield Signs. mycrazyhobby.com. (原始内容存档于2017-12-28) (英语). History of the Yield sign. Road Traffic Signs. (原始内容存档于2021-07-24) (英语)