^Ledger, Frank Joseph Francis, Sir; Shervington, Christine (1982), [Interview with Sir Frank Ledger], retrieved 17 June 2024{{citation}}: CS1 maint: multiple names: authors list (link)
^"LOCAL INDUSTRIES". Daily News. Vol. X, no. 3143. Western Australia. 3 November 1891. p. 3. Retrieved 6 June 2018 – via National Library of Australia.
^"LOCAL INDUSTRIES". The West Australian. Vol. XIX, no. 5, 275. Western Australia. 5 February 1903. p. 6. Retrieved 6 June 2018 – via National Library of Australia.
^"J. AND E. LEDGER'S FOUNDRY". Western Mail. Vol. XVIII, no. 893. Western Australia. 7 February 1903. p. 18. Retrieved 6 June 2018 – via National Library of Australia.
^Hobson, Sue (2015), Cast iron pillar boxes of Western Australia : an early history of the J & E Ledger foundry, Sue Hobson, ISBN978-0-9943396-0-7