"British racer selects Viking". The South Bend Tribune. Vol. 56, no. 310. South Bend, Indiana. April 6, 1930. Section 3 p. 4. Archived from the original on July 15, 2021. Retrieved March 26, 2021 – via Newspapers.com.
Klein, Israel (June 1, 1929). "Marquette enters motordom". The Grand Island Independent. Vol. 46, no. 130. Grand Island, Nebraska. p. 12. Archived from the original on July 15, 2021. Retrieved March 26, 2021 – via Newspapers.com.
si.edu
americanhistory.si.edu
"Viking Radiator Emblem". National Museum of American History. Archived from the original on July 15, 2021. Retrieved December 7, 2020.
"British racer selects Viking". The South Bend Tribune. Vol. 56, no. 310. South Bend, Indiana. April 6, 1930. Section 3 p. 4. Archived from the original on July 15, 2021. Retrieved March 26, 2021 – via Newspapers.com.
Klein, Israel (June 1, 1929). "Marquette enters motordom". The Grand Island Independent. Vol. 46, no. 130. Grand Island, Nebraska. p. 12. Archived from the original on July 15, 2021. Retrieved March 26, 2021 – via Newspapers.com.
"Viking Radiator Emblem". National Museum of American History. Archived from the original on July 15, 2021. Retrieved December 7, 2020.