His The comic English grammar, 1858 (name not given)
Concise DNB (Leigh, Percival; comic writer; studied medicine at St. Bartholomew’s Hospital; abandoned medicine for literature; joined staff of Punch in 1841; b. 1813; d. 1889)
MWA/NAIP files (hdg.: Leigh, Percival, 1813-1889; usage: Percival Leigh; Punch; Author of The comic Latin grammar; Author of The comic English grammar)
Heads of the people, 1840: p. 41 (The medical student, by Paul Prendergast) contents (The medical student / P. Leigh)
Oxford DNB (WWW), Apr. 12, 2006 (Leigh, Percival, satirist; b. Haddington, Scotland, Nov. 3, 1813; d. Hammersmith, Oct. 24, 1889)