Open Court
Wikipedia: https://en.wikipedia.org/wiki/Open_Court_Publishing_Company
Archives: Open Court Publishing Company Records, 1886-1998, Southern Illinois University, Special Collections Research Center, https://7009.sydneyplus.com/final/Portal/SIU.aspx?lang=en-US.
Ralph E. McKoy, comp., OPEN COURT: A CENTENNIAL BIBLIOGRAPHY, 1887-1987 (Open Court 1987).