He held the posts of Permanent Under-Secretary, Ministry of Food, 1946–1948, Permanent Under-Secretary of State for Commonwealth Relations, 1949–1955, and High Commissioner in South Africa, 1955–1958.
- "Liesching, Sir Percivale". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/64154. (Subscription or UK public library membership required.)
- LIESCHING, Sir Percivale, Who Was Who, A & C Black, 1920–2015 (online edition, Oxford University Press, 2014)