(en) « Awards of the Comet-Medal of the ASP (1890-1896) », Publications of the Astronomical Society of the Pacific, San Francisco, vol. 9, , p. 99 (JSTOR40671005, lire en ligne) He won the Donohoe Comet Medal for his November 1890 discovery of the comet now known as 113P/Spitaler.
(en) « Awards of the Comet-Medal of the ASP (1890-1896) », Publications of the Astronomical Society of the Pacific, San Francisco, vol. 9, , p. 99 (JSTOR40671005, lire en ligne) He won the Donohoe Comet Medal for his November 1890 discovery of the comet now known as 113P/Spitaler.