"Henry W. Butner"(PDF). The Field Artillery Journal. 27 (2). United States Field Artillery Association: 106–109. March–April 1937. Archived from the original(PDF) on January 26, 2017. Retrieved January 5, 2023.
Linnerud, Susan. "The Spanish War Class". United States Military Academy Library. Archived from the original on June 18, 2006. Retrieved September 30, 2016.
Linnerud, Susan. "The Spanish War Class". United States Military Academy Library. Archived from the original on June 18, 2006. Retrieved September 30, 2016.
"Henry W. Butner"(PDF). The Field Artillery Journal. 27 (2). United States Field Artillery Association: 106–109. March–April 1937. Archived from the original(PDF) on January 26, 2017. Retrieved January 5, 2023.