Earle Buckingham, Henry H Ryffel, . (1960). Design of Worm and Spiral Gears. New York: The Industrial Press.
Earle Buckingham, Henry H Ryffel, . 1960. Design of Worm and Spiral Gears. New York: The Industrial Press.
Earle Buckingham, Henry H Ryffel, . Design of Worm and Spiral Gears. New York: The Industrial Press. 1960.