Sanjay Salomon (2015-12-10). Road news: Snow zone signs get a new look. Boston.com.
Virginia Bruce (2018-11). Road news: Snow zone signs get a new look. The Cedar Mill News. Pioneer Marketing & Design. Retrieved on 2018-12-02.
(2018-12-10). "Chain-up or pay up on Snoqualmie". Enumclaw Courier-Herald. Retrieved on 2024-01-15.