- Woodward Governor Company controls in a 1921 S. Morgan Smith Company catalog..
- The Pelton Water Wheel Company advertisement.
- WGC 1987. 2
- WGC ANNUAL REPORT 1987
- Woodward...At the Heart of the Energy Control System Since 1870.
- WGCPMC CTL OCTOBER 1993
- WGC PMC CTL SECOND QUARTER 1999
- WGC PMC CTL MAY 1989
- WGC CTL NOVEMBER 1986
- WGC CTL NOVEMBER 1985
- WGC PRIME MOVER CONTROL HISTORY PROJECT.
- WGC PMC JULY 1995
- WGC PMC OCTOBER 1993
- WGC PMC NOVEMBER 1986
- WGC PMC MAY 1989.