| Sources |
- [S978] Ancestry Family Trees, Magical Mystery Tour; Cassie-Anne Heming; AU; Allsopp; 21 January 2024.
- [S1447] _Births, Deaths and Marriages, NSW, Harold G Allsopp; Birth; Index; 24344; 1890; Newcastle.
- [S1447] _Births, Deaths and Marriages, NSW, Harold Georg Allsopp; Death; Index; 102970; 1979; Waratah.
- [S1489] The Ryerson Index x, Sydney Morning Herald; Death Notice; Harold George Allsopp; 11 May 1979; 7 November 2025.
- [S1447] _Births, Deaths and Marriages, NSW, Thomas H Allsopp + Elizabeth Shepherd; Marriage; Index; 6297; 1889; Newcastle.
- [S1447] _Births, Deaths and Marriages, NSW, Harold G Allsopp + Amy Harrison; Marriage; Index; 6034; 1918; Adamstown.
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