Engineers, Society of Automotive (1959). The SAE Journal. Society of Automotive Engineers. p. 70. Archived from the original on 2021-04-01. Retrieved 2020-11-12.
Engineers, Society of Automotive (1959). The SAE Journal. Society of Automotive Engineers. p. 70. Archived from the original on 2021-04-01. Retrieved 2020-11-12.