http://nla.gov.au/nla.obj-147703334
Harrison, J. T. (1931). Engineer Tommy Pethybridge working on Southern Star, Avro X monoplane VH-UMG, with Charles Kingsford Smith, ca. 1931 Retrieved December 15, 2025, from http://nla.gov.au/nla.obj-147703334
Harrison, J. T. Engineer Tommy Pethybridge working on Southern Star, Avro X monoplane VH-UMG, with Charles Kingsford Smith, ca. 1931 : , 1931. Web. 15 December 2025 <http://nla.gov.au/nla.obj-147703334>
Harrison, J. T. 1931, Engineer Tommy Pethybridge working on Southern Star, Avro X monoplane VH-UMG, with Charles Kingsford Smith, ca. 1931 , viewed 15 December 2025 http://nla.gov.au/nla.obj-147703334
{{Citation
| author1=Harrison, J. T.
| title=Engineer Tommy Pethybridge working on Southern Star, Avro X monoplane VH-UMG, with Charles Kingsford Smith, ca. 1931
| year=1931
| section=1 photograph : sepia toned ; 16 x 21 cm.
| series=Charles Ulm national aviation collection
| issue=PIC/8392/321
| publisher=
| url=http://nla.gov.au/nla.obj-147703334
| id=nla.obj-147703334
| access-date=15 December 2025
| via=Trove
}}
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