- I N Sneddon, Biography in
*Dictionary of Scientific Biography*(New York 1970-1990).

See THIS LINK.**Books:** - W Trail,
*Life and Writings of Robert Simson*(Bath, 1812).**Articles:** - I Tweddle, John Machin and Robert Simson on inverse-tangent series for π,
*Arch. Hist. Exact Sci.***42**(1) (1991), 1-14.

- I Tweddle, Some results on conic sections in the correspondence between Colin MacLaurin and Robert Simson,
*Arch. Hist. Exact Sci.***41**(4) (1991), 285-309.